List of The Flash episodes

For the episodes from the 1990 series, see The Flash (1990 TV series) § Episodes.

Watch Full The Flash Season 3 Episode 21 : Cause and Effect

The Flash is an American action television series developed by Greg Berlanti, Andrew Kreisberg, and Geoff Johns, airing on The CW. It is based on the DC Comics character Barry Allen / Flash, a costumed crimefighter with the power to move at superhuman speeds. It is a spin-off from Arrow, existing in the same fictional universe. The series follows Barry Allen, portrayed by Grant Gustin, a crime scene investigator who gains superhuman speed, which he uses to fight criminals, including others who have also gained superhuman abilities. The Flash was renewed in March 2016 for a third season, which premiered on October 4, 2016. On January 8, 2017, The CW renewed the show for a fourth season.

Series overview

Season	Episodes		Originally aired		Rank	Average viewership (in millions)
			First aired	Last aired
1	23		October 7, 2014 (2014-10-07)	May 19, 2015 (2015-05-19)	118	4.62
2	23		October 6, 2015 (2015-10-06)	May 24, 2016 (2016-05-24)	112	4.25
3	23		October 4, 2016 (2016-10-04)	May 23, 2017 (2017-05-23)	TBA	TBA

Episodes

Season 1 (2014–15)

No. overall	No. in season	Title	Directed by	Written by	Original air date	Prod. code	U.S. viewers (millions)
1	1	"Pilot"	David Nutter	Story by : Greg Berlanti & Andrew Kreisberg & Geoff Johns Teleplay by : Andrew Kreisberg & Geoff Johns	October 7, 2014 (2014-10-07)	296648	4.83
Barry Allen, a forensic crime scene assistant for Central City Police Department, is struck by lightning during a storm that is created after a particle accelerator from S.T.A.R. Labs explodes. In a coma for nine months, Barry awakens in S.T.A.R. Labs, having been placed in the care of Dr. Harrison Wells and his assistants Dr. Caitlin Snow and Cisco Ramon. Barry learns that he can move at extraordinary speeds, and that there were other "metahumans" created from the explosion. One of them, Clyde Mardon, is robbing banks with his ability to control the weather. In order to stop Mardon, Barry is outfitted with a suit, designed by Cisco, that can withstand his high speed. He tracks down Mardon and with Detective Joe West, who learns of Barry's abilities, Barry is able to stop Mardon, who is killed by Joe. With his new powers, Barry vows to exonerate his father, Henry, who is incarcerated for the accusation of murdering his wife, Nora, whom Barry witnessed being killed by another metahuman. He chooses the alias "Flash" for his alter ego. Wells, secretly revealed to be neither paraplegic nor needing glasses, reads a newspaper from 2024 stating the missing status of the Flash.
2	2	"Fastest Man Alive"	David Nutter	Story by : Greg Berlanti & Andrew Kreisberg Teleplay by : Andrew Kreisberg & Geoff Johns	October 14, 2014 (2014-10-14)	3J5352	4.27
In flashbacks, it is revealed that Joe became Barry's legal guardian but did not let him visit Henry in prison at the latter's request. Barry begins using his abilities to stop minor crimes and help citizens across the city while starting to develop debilitating side effects. While guiding Iris West, who seeks his help to do her school assignment, Barry witnesses a robbery by a crew of men, but passes out while trying to stop them. The S.T.A.R. Labs team determines that Barry becomes hypoglycemic from the use of his abilities due to a sped-up metabolism and needs to ingest more calories to maintain his energy level. The team eventually learns that there is actually one robber, Danton Black, who has the ability to create clones of himself. Black intends to kill his former employer Simon Stagg, who stole Black's cloning research. With encouragement from Joe, Barry goes after Black and successfully stops him. However, Black commits suicide. Afterward, Barry accepts Joe's help in the investigation of Nora's murder. Later, Wells visits Stagg, who has already become obsessed with the Flash and plans to exploit them as he did to Black. Wells then kills Stagg.
3	3	"Things You Can't Outrun"	Jesse Warn	Alison Schapker & Grainne Godfree	October 21, 2014 (2014-10-21)	3J5353	3.59
As the police investigate the murder of one of the city's crime families, Barry suspects that the killer may be a metahuman who can control poison gases. As Barry and Joe work to discover the killer's identity, Wells and his team work to retrofit the particle accelerator into a prison for metahumans where they can begin to find a way of reversing their mutations. This brings up difficult feelings and memories for Snow, whose fiancé, Ronnie Raymond, was killed by the explosion. The team identifies the killer as Kyle Nimbus, discovering that Nimbus does not control gases, but transforms his body into them. The team learns that Joe, the lead detective in the original case, is Nimbus' next target. Barry races to Iron Heights Prison to save Joe's life, forcing Nimbus to overexert himself so that he can apprehend him. The team locks Nimbus into a cell they have made. In a flashback to when the accelerator explodes, Wells is seen going into his hidden room and viewing a surveillance video of Barry getting struck by lightning in his lab.
4	4	"Going Rogue"	Glen Winter	Geoff Johns & Kai Yu Wu	October 28, 2014 (2014-10-28)	3J5354	3.53
Wells begins testing Barry's powers by having him perform multiple tasks at superspeed. In the middle of the tests, a group of men attempt to hijack an armored truck carrying a diamond. Barry races over and stops the crime, as well as identifying Leonard Snart from a set of police mugshots. Felicity Smoak arrives to check on Barry, after learning that he woke from his coma. Barry introduces her to his friends at S.T.A.R. Labs. To combat the Flash, also known as the "Streak", Snart acquires stolen tech from S.T.A.R. Labs, which includes a cryonic gun. Cisco reveals to Barry that he created the gun as a fail-safe against Barry should he become a villain like the other metahumans they have encountered. Felicity helps the team locate Snart, who sets a trap for Barry. Cisco, Caitlin, and Felicity arrive in time to save Barry, and Snart is able to escape. Joe finally accepts Iris's relationship with Eddie Thawne, his partner. Wells demands Cisco not to build another fail-safe against Barry again. Later, Snart tracks down his former partner, who has an affinity for fire, and offers him a place by Snart's side taking back Central City from the Flash.
5	5	"Plastique"	Dermott Downs	Aaron Helbing & Todd Helbing & Brooke Eikmeier	November 11, 2014 (2014-11-11)	3J5355	3.46
Bette Sans Souci, a metahuman with the ability to turn anything she touches into an explosive, appears in Central City. She is being hunted by General Wade Eiling, and is a former military explosives expert. Barry brings her to S.T.A.R. Labs where the team explains to her that she was changed by the particle accelerator, which bonded bomb shrapnel to her body on a cellular level; and they cannot reverse the process. Secretly, Wells convinces Bette to kill Eiling. Barry races to stop her, and Eiling shoots her, who dies after mentioning Wells' name. Her body turns into a bomb. Barry speeds off with the body and drops it in the river to save the city from the massive explosion. Eiling visits Wells, demanding that they work together once again, this time to collect metahumans. Wells refuses and warns Eiling to never return to S.T.A.R. Labs. Meanwhile, Barry ends his friendship with Iris after she refuses his advice not to write about the "Streak". In a flashback set five years previously, Wells tells Eiling he is ending their experiments. After Eiling leaves, Wells walks to a cage and tells Gorilla Grodd that he has plans for him.
6	6	"The Flash Is Born"	Millicent Shelton	Jaime Paglia & Chris Rafferty	November 18, 2014 (2014-11-18)	3J5356	3.73
Barry speeds off to stop a car thief; but the thief's skin turns to steel and Barry breaks his hand while punching. He runs back to the lab before he can be hurt further. The thief is identified as Tony Woodward, Barry's childhood bully. Back at the lab, Cisco determines that if Barry can hit Woodward with a specific velocity at right angle, then he can create enough force to compromise Woodward's metal structure. Woodward kidnaps Iris and demands that she write about him. Barry arrives and manages to temporarily disable Woodward's abilities. Afterward, Woodward is locked away at S.T.A.R. Labs and finds out that Barry is the Flash, the name Iris also uses in her blog on the advice of Barry, who reconciles with her. Meanwhile, Joe continues investigating Nora's murder and gets suspicious of Wells, who opened S.T.A.R. Labs one month after Nora's murder; but Wells states that he came to Central City because of his wife's death. Joe, convinced that Wells is not involved, is visited by the metahuman that killed Nora, stealing the case file and threatening Iris's life if Joe does not drop his investigation.
7	7	"Power Outage"	Larry Shaw	Alison Schapker & Grainne Godfree	November 25, 2014 (2014-11-25)	3J5357	3.47
Wells returns to his secret room, where it is revealed that he has been documenting Barry's abilities, and using his artificial intelligence, Gideon, to look at events in the future. Barry arrives at a crime scene where the victim was murdered via electrocution, and charred beyond recognition, suggesting a metahuman was involved. While investigating the victim's identity, the team identifies a power drain in the city. When Barry arrives, he is attacked by Farooq Gibran, a man who has the ability to siphon electrical energy. The attack drains Barry of his speed, and Gideon reveals to Wells that there are currently no references to the Flash in the future. Wells realizes that Barry's problem is psychological. Gibran attacks S.T.A.R. Labs , kills Woodward and Wells' life gets in danger, forcing Barry to overcome his fear, connect to his speed and kill Gibran. Meanwhile, Tockman starts a hostage crisis at a police station and critically shoots Eddie; but Iris manages to stop him and he is rearrested. Later, Wells sees that the timeline is safe, and takes a sample of Gibran's blood to determine how he was able to drain Barry's abilities.
8	8	"Flash vs. Arrow"	Glen Winter	Story by : Greg Berlanti & Andrew Kreisberg Teleplay by : Ben Sokolowski & Brooke Eikmeier	December 2, 2014 (2014-12-02)	3J5358	4.34
Eddie proposes a task force to hunt down the Flash. A new metahuman, Roy Bivolo, shows up with the ability to send people into an uncontrollable rage, and uses his ability to rob a bank. Oliver Queen informs Barry that he and his team are tracking a killer who uses lethal boomerangs. Barry and Oliver agree to team-up and catch each other's targets. Barry decides to go after Bivolo by himself. Bivolo uses his abilities on Barry; but because of Barry's powers it makes the effects last longer. Oliver tries to stop Barry, and the two engage in a fight until Wells and Joe use colored strobe light to reset Barry's emotional state. Afterward, Barry and Oliver capture Bivolo and place him in the prison at S.T.A.R. Labs. Eddie's task force is established after he was beaten by an enraged Flash. Barry confirms Oliver's belief that the former has a lot to learn. Oliver advises him to stay away from Iris, whom Barry is in love with. Iris decides to end her support of the Flash. Oliver asks Barry's team to keep his alter ego a secret. A new metahuman able to manipulate fire appears in Central City. This episode begins a crossover that continues on Arrow season 3 episode 8.
9	9	"The Man in the Yellow Suit"	Ralph Hemecker	Todd Helbing & Aaron Helbing	December 9, 2014 (2014-12-09)	3J5359	4.66
The yellow-suited speedster who killed Nora Allen returns, in search of Mercury Lab's tachyon particle technology. Barry encounters the "Reverse-Flash" and engages him but is swiftly defeated, with the villain insinuating that he and Barry have been lifelong enemies. Ronnie is revealed as the flame-controlling metahuman, suffering from memory-loss after having survived the explosion. Per Henry's advice, Barry confesses his love for Iris before the tachyon particle technology is used as bait to lure the Reverse-Flash into a trap. The villain manages to escape, however, and proceeds to attack Wells and the police, mysteriously sparing Eddie before engaging in Barry again. Ronnie appears and fends off the Reverse-Flash before they both flee the scene. Joe tells Eddie about metahumans and asks him to keep it a secret. Cisco realizes that there were two speedsters in Barry's house the night Nora died. Later, Wells enters his secret room and reveals the Reverse-Flash suit in a hidden chamber. Wells places the stolen tachyon device on it, and speaks in the villainous speedster's distorted voice, revealing himself to be the Reverse-Flash.
10	10	"Revenge of the Rogues"	Nick Copus	Kai Yu Wu & Geoff Johns	January 20, 2015 (2015-01-20)	3J5360	3.87
As Barry works on improving his speed through various training exercises, Leonard Snart returns to Central City with the cold gun and a new partner, Mick Rory, to set a trap for the Flash. Barry discovers his plan, and agrees with Wells not to engage Snart in the hope that he goes away and no one gets hurt like the last time. Snart and Rory, who now has a gun that can emit absolute hot temperatures, kidnap Caitlin to force Barry out of hiding. Cisco and Barry find a way to defeat Snart and Rory. The Flash faces the duo in the city for a showdown, exposing himself to the public. Barry eventually gets them to cross their streams with Eddie's help, successfully damaging the weapons and disabling the pair, who are arrested and the guns delivered to S.T.A.R. Labs. While in transport to Iron Heights, Snart and Rory are broken out by Snart's sister. Meanwhile, Caitlin investigates the cause of Ronnie's transformation and finds out that the Army is covering up the incident. After Iris moves in with Eddie, Barry decides to move back in with Joe.
11	11	"The Sound and the Fury"	John F. Showalter	Alison Schapker & Brooke Eikmeier	January 27, 2015 (2015-01-27)	3J5361	4.08
While home, Wells receives a threatening call from an unidentified person before using his super speed to save his life from an attempt. Wells informs Barry and the team that the caller was Hartley Rathaway, a former protégé. Rathaway begins attacking his family's business with sonic blasts, and after Barry stops him, Rathaway reveals that he knows a secret of Wells', who states that Rathaway warned him that the particle accelerator could explode, but Wells chose to risk it for the rewards. Cisco discovers that Rathaway intentionally got caught so he could steal information from S.T.A.R. Labs that would allow him to identify the frequency of Barry's molecules so he can kill him. A trap set by Rathaway starts shredding Barry's organs. Wells manages to disable Rathaway's weapons. Later, Joe has Eddie start an investigation into Wells. Rathaway, imprisoned back in the particle accelerator, reveals to Cisco that he knows where Ronnie is and how to save him. In his secret room, Wells uses the tachyon technology to temporarily recharge his speed force energy. Meanwhile, Iris starts working as a journalist and realizes that she is hired to write about the Flash.
12	12	"Crazy for You"	Rob Hardy	Aaron Helbing & Todd Helbing	February 3, 2015 (2015-02-03)	3J5362	3.60
A woman with the ability to teleport to any location she can see breaks into Iron Heights and frees her boyfriend, Clay Parker. The S.T.A.R. Labs team identifies the woman as Shawna Baez. To help Barry, Henry tracks down leads in Iron Heights and finds out that Parker owed money to a local crime boss and is planning a heist to pay it back. Barry learns the location of the heist, finding Baez and Parker and is able to capture her after removing all the lights in a tunnel, effectively making her unable to teleport without being able to see. Parker manages to escape. Meanwhile, Cisco brings Rathaway out of his cell so that the latter can show the truth about Ronnie; Rathaway reveals that Doctor Martin Stein, who developed research into a F.I.R.E.S.T.O.R.M. project focused on transmuting elements, was at S.T.A.R. Labs the day of the explosion. Rathaway reveals that during the explosion Ronnie and Stein merged, before he escapes Cisco's custody. Barry starts dating Iris's colleague, Linda Park. Henry insinuates to Barry that he knows Barry's alter ego. Elsewhere, two city workers are attacked by Grodd.
13	13	"The Nuclear Man"	Glen Winter	Andrew Kreisberg & Katherine Walczak	February 10, 2015 (2015-02-10)	3J5363	3.66
The team attempts to track Stein's whereabouts after he attacks a scientist. They convince Stein into coming back to S.T.A.R. Labs for testing. Wells discovers that Ronnie and Stein's atoms are in conflict, and if it continues they will become nuclear. Stein leaves for a secluded location to safely explode without casualties. Barry and Caitlin arrive and use a device Wells made from the tachyon to separate the bodies, but it apparently does not work, and the duo escapes the explosion, which alerts Eiling, who orders a team to recover "Firestorm". Meanwhile, Joe enlists Cisco's help to identify Nora's murderer. The duo searches the house and finds blood from two people behind some new wallpaper. Joe asks Cisco to compare the blood to Wells'. Cisco runs the blood and informs Joe that while neither is from Wells, one is from an adult Barry. In the meantime Linda believes Barry to be still in love with Iris, but he proves to Linda that he now loves her not Iris.
14	14	"Fallout"	Steve Surjik	Keto Shimizu & Ben Sokolowski	February 17, 2015 (2015-02-17)	3J5364	4.01
Barry and Caitlin find Ronnie and Stein alive and separated, which Eiling also finds out. Joe reveals his findings to Barry. Ronnie and Stein realize that their minds are partially connected. Wells visits Eiling, who reveals that he knows Barry's alter ego and demands the F.I.R.E.S.T.O.R.M. project. Wells gives up Stein, who is tortured by Eiling until Barry and Ronnie save him. Ronnie and Stein reunite by the tachyon piece to survive the military onslaught. The duo gains enough control to be able to merge and separate on command. They decide to leave Central City to stay ahead of Eiling and learn more about their new powers. As the Reverse-Flash, Wells kidnaps Eiling and brings him to the sewers. He reveals himself to Eiling, and allows Grodd, who is displaying psychic abilities, to drag Eiling deeper into the sewer. Meanwhile, Iris's colleague, Mason Bridge tells her his belief that Wells deliberately caused the S.T.A.R. Labs explosion. Iris suspects Caitlin's activities and decides to help Mason with his investigation. Barry tells Joe that he will travel back in time again to save Nora, but intends to succeed by learning the mistakes in his previous attempt.
15	15	"Out of Time"	Thor Freudenthal	Todd Helbing & Aaron Helbing	March 17, 2015 (2015-03-17)	3J5365	3.69
Mark Mardon, Clyde's brother, returns to Central City to avenge Clyde's death. Eddie and Linda get jealous of the intimacy between Barry and Iris. Mason shares his knowledge that Wells killed Stagg with Iris and Barry, who tells Caitlin and Cisco, who begins to believe Joe was right about Wells, so he rechecks the containment field that failed to hold the Reverse-Flash. Wells arrives and reveals himself to be Eobard Thawne, a relative of Eddie's and a man from the future who came back in time to kill Barry, and has since been stranded in the present day. Thawne also explains that he is pushing Barry to get stronger so that he can use Barry's powers to return to his time, and he murders Cisco to protect his secret. Mardon kidnaps Joe and forces him to watch as Mardon creates a tsunami in order to kill Iris. Barry reveals his secret identity to Iris, just after they admit to romantic feelings for each other, in order to save the city. Barry runs back and forth across the coastline to create a barrier against the tsunami, but he runs so fast that he travels back in time to the day before.
16	16	"Rogue Time"	John Behring	Story by : Grainne Godfree Teleplay by : Brooke Eikmeier & Kai Yu Wu	March 24, 2015 (2015-03-24)	3J5366	3.33
Thawne warns Barry not to change any event for fear that he will create a bigger problem. Barry does not listen and instead captures Mardon and puts him in the particle accelerator. Snart and Rory return to Central City. Snart sends his sister, Lisa after Cisco, whom they force to rebuild the cold and heat guns, and a third gun shooting gold for Lisa, by threatening to kill Cisco's brother. Iris rejects Barry's romantic approach and later Eddie punches him. Barry realizes that Thawne was right about not to manipulate the timeline. Cisco returns and reveals that Snart forced him to reveal the Flash's true identity. Barry goes after Snart, and the two come to a truce: Snart will not reveal Barry's identity, will no longer kill innocent people, and stay away from Barry's loved ones in exchange for Barry not locking him away in the particle accelerator. Caitlin tells Eddie and Iris that Barry is suffering from psychosis as a result of the lightning, making the duo reconcile with him and settling the tension. The Reverse-Flash kills Mason and destroys the evidence linking Thawne to Stagg's death. Mason's vanishing causes Barry to accept Joe was right about "Wells".
17	17	"Tricksters"	Ralph Hemecker	Andrew Kreisberg	March 31, 2015 (2015-03-31)	3J5367	3.67
Barry and Joe go after terrorist Axel Walker, under the alias Trickster. Walker sets a diversion for the Flash and breaks James Jesse, the original Trickster from 20 years prior, out of prison. Jesse and Walker attempt to extort patrons of fundraiser by poisoning them and ransoming the antidote. When the Flash arrives, Jesse and Walker fit him with a bomb that will detonate if he stops moving. Thawne coaches Barry on how to vibrate his molecules so that he can phase through objects, which removes the bomb. Afterward, Barry provides an antidote to all the patrons before capturing Jasse and Walker. The Flash reveals his identity to Eddie and convinces him to keep Iris from investigating Mason's disappearance. Barry tells Eddie and Joe that "Wells" is the Reverse-Flash. In flashbacks, after failing to kill Barry, the Reverse-Flash escapes only to lose his speed. Gideon informs him that travelling through time has drained his powers. Thawne kills Harrison Wells and steals his appearance and identity so he can develop the particle accelerator sooner and return to his timeline.
18	18	"All Star Team Up"	Kevin Tancharoen	Grainne Godfree & Kai Yu Wu	April 14, 2015 (2015-04-14)	3J5368	3.67
As Barry works in conjunction with Joe and Eddie to stop crimes across the city, an engineering professor is killed by a swarm of bees at a university. While the team searches for a metahuman that can control bees, Felicity arrives with Ray Palmer, looking for assistance to improve his A.T.O.M. suit. The team tracks another bee attack, but Barry is too late and is attacked by the swarm. The team captures one of the bees, which turns out to be a robot and their suspect just a scientist from Mercury Labs named Brie Larvan, who is targeting other former employees. During the next bee attack, Barry goes after Larvan while Ray attempts to stop the bees from killing Dr. Tina McGee. Felicity disables the robots, and Barry captures Larvan. Tina tells Barry that "Wells" personality changed after his wife's demise. Iris threatens Eddie to break up if he does not share his secret. Barry informs Caitlin and Cisco about "Wells". She does not want believe it, but Cisco does, revealing that he has been having "dreams", which show his final moments with Thawne in the alternate timeline.
19	19	"Who Is Harrison Wells?"	Wendey Stanzler	Ray Utarnachitt & Cortney Norris	April 21, 2015 (2015-04-21)	3J5369	3.75
Barry and Eddie track a metahuman named Hannibal Bates, who can shape-shift into anyone he touches. Bates takes Eddie's shape and frames him for murder. Later, Bates knocks Barry unconscious and assumes his form, but Thawne realizes the truth and prevents Bates from killing Caitlin and Iris. Bates manages to escape. Caitlin develops a serum to suppress Bates' power, allowing Barry to defeat him and clear Eddie's name. Iris reconciles with Eddie, who reveals his cooperation with the Flash. Bates is locked in the particle accelerator. Meanwhile, Joe and Cisco decide to investigate the car accident scene in Starling City where Dr. Wells' wife died. With the help of Captain Quentin Lance, Cisco and Joe locate a buried corpse near the crash site. Cisco also modifies a sonic device for Laurel. Joe advises Quentin to reconcile with her. After a series of tests confirm the corpse is the real Dr. Wells, Barry, Caitlin and Cisco locate Thawne's secret room at S.T.A.R. Labs. They find both the Reverse-Flash's costume and the newspaper article from 2024.
20	20	"The Trap"	Steve Shill	Alison Schapker & Brooke Eikmeier	April 28, 2015 (2015-04-28)	3J5370	3.93
Barry talks to Gideon and learns about his battle with the Reverse-Flash in the future, as well as key moments in his life that include marrying Iris, a promotion at the CCPD, and that he created Gideon in the future. With high-tech goggles, the team reawakens Cisco's memories of his alternate-timeline death and the secrets Wells confessed. The team regroups at Joe's house, where Barry reveals his recent time travel and explains his plan to lure Thawne to confess to killing Nora. To trap Thawne, Cisco reverses the polarity of his containment field to protect himself from Thawne, while Caitlin films the interaction to capture Thawne's confession. The trap fails, but Joe shoots Thawne before he can kill Cisco. As Thawne dies, his body transforms, revealing himself to be Bates. Thawne himself calls the team, revealing that he was always aware of their actions because he had them under surveillance. Reverse-Flash goes after Iris and Eddie, but Barry arrives, forcing Thawne to kidnap Eddie instead. Iris finds out about the Flash's identity. Thawne reveals his relation to Eddie. Flashbacks reveal the aftermath of Barry being struck by lightning, and Thawne convincing Joe to let him save Barry's life, and promising to a comatose Barry that he will die.
21	21	"Grodd Lives"	Dermott Downs	Grainne Godfree & Kai Yu Wu	May 5, 2015 (2015-05-05)	3J5371	3.62
While looking for Eddie and Eobard, Barry heads to stop a robbery at the gold reserve. When Barry confronts the would-be thief, they are both disoriented by an unknown psychological attack. Back at S.T.A.R. Labs, Iris confronts Barry about being the Flash. He is able to stop the thief, who turns out to be Eiling, whose mind is revealed to be controlled by Grodd. With a lead from Iris, Barry, Joe and Cisco head into the sewers to look for Grodd. The trio realize that Grodd is getting smarter and larger, and during an attack, Joe is kidnapped by Grodd. Cisco and Caitlin build Barry a device that will prevent Grodd's effect. It works, but the device gets damaged in a fight. Barry is able to fight off Grodd's psychic attack and trick him into jumping in front of an on-coming train. Eiling is freed. Iris reveals her feelings for Barry, but states her choice to be with Eddie. Grodd is revealed to be safe and roaming the streets. Meanwhile, Thawne works on a device that will allow him to return to his own time. He reveals to Eddie, Iris and Barry's marriage in the future. Later Thawne completes the device and is revealed to be hiding in a secret chamber inside S.T.A.R. Labs.
22	22	"Rogue Air"	Doug Aarniokoski	Aaron Helbing & Todd Helbing	May 12, 2015 (2015-05-12)	3J5372	3.65
Cisco discovers that Eobard has been supercharging his speed through his wheelchair, which is why he is so much faster than Barry. The particle accelerator is activated by Eobard, who has managed to repair it. The team is able to find and rescue Eddie, who ends his relationship with Iris. Worried that the metahumans imprisoned inside the particle accelerator will be killed when it reaches full power, the team plans to relocate them to Oliver's prison on Lian Yu. In order to set up a safe transport, Barry requests Leonard's help. Leonard agrees but only after Barry erases all of the former's criminal record. Leonard and Lisa sabotage the transport and allow the metahumans to escape, killing Simmons however. Eobard arrives back at the lab just as the accelerator fully charges. Barry, Firestorm and Oliver all meet outside to fight Reverse-Flash. They coordinate their efforts; Oliver stops him with a nanite injection that disables Eobard's speed and knocks him out. Oliver leaves after informing Barry of an upcoming help request.
23	23	"Fast Enough"	Dermott Downs	Story by : Greg Berlanti & Andrew Kreisberg Teleplay by : Gabrielle Stanton & Andrew Kreisberg	May 19, 2015 (2015-05-19)	3J5373	3.87
Barry visits Thawne in the particle accelerator prison, where he reveals he killed Nora because of hating the Flash, whose future self saved him. Eobard requests Barry to help create a wormhole where Thawne can return to his time, while also allowing Barry to save Nora. Caitlin and Ronnie get married. Eobard tells Cisco that the latter's ability to recall events of alternate timelines was acquired from the particle accelerator explosion. Barry decides to go through with Thawne's offer. The latter states that Barry will have only a short time, or else the wormhole will become a black hole. Barry travels back in time, but his future self signals him not to save Nora. The present Barry returns and stops Thawne from returning to his time. The two fight, while the team shuts down the wormhole. Thawne eventually prevails, but before he can kill Barry, Eddie shoots himself, causing Thawne's existence to cease. The wormhole reappears, and the team is unable to prevent it from becoming a black hole. As the black hole begins to tear the city apart, pulling Eddie inside, Barry speeds into it in an effort to stop it.

Season 2 (2015–16)

No. overall	No. in season	Title	Directed by	Written by	Original air date	Prod. code	U.S. viewers (millions)
24	1	"The Man Who Saved Central City"	Ralph Hemecker	Story by : Greg Berlanti & Andrew Kreisberg Teleplay by : Andrew Kreisberg & Gabrielle Stanton	October 6, 2015 (2015-10-06)	3J5651	3.58
Ronnie and Stein turn into Firestorm and destroy the singularity, but at the cost of Ronnie's life. Six months later, while using his speed to repair Central City, Barry operates alone, being the hero and savior of the public and the local government; Cisco works in the police department alongside Joe, and Caitlin works at Mercury Labs. Barry evaluates a crime scene with a victim named Al Rothstein. At a ceremony, the Flash is attacked by Atom-Smasher, whose strength and size manipulation prove too much for Barry, but manages to force his mask off. Underneath the mask Atom-Smasher is revealed to look exactly like Rothstein. Barry is convinced by Joe and the others that he needs help in taking down certain metahumans and Rothstein is defeated by over absorbing radiation. As he dies, Rothstein tells Barry that he was sent to kill him by a person called Zoom. Barry receives a flash memory from Thawne's lawyer containing Thawne's confession to killing Nora. Henry is exonerated and released from prison, and leaves Central City so that Barry can focus on being the Flash. A man arrives at S.T.A.R. Labs and, introducing himself as Jay Garrick, tells the team their world is in danger.
25	2	"Flash of Two Worlds"	Jesse Warn	Aaron Helbing & Todd Helbing	October 13, 2015 (2015-10-13)	3J5652	3.49
Jay explains to everyone that he is the Flash on a parallel Earth and that he was in a battle with a demonic speedster named Zoom when the singularity brought him to this Earth without his powers. Stein confirms the claim, describing their world as "Earth-1" and Jay's as "Earth-2". Zoom brings another metahuman from Earth-2 called Sand Demon, later identified as Eddie Slick, to kill the Flash. Cisco analyzes the "sand" left behind and has a vision of the previous fight, frightening him. After Slick kidnaps Officer Patty Spivot, Jay teaches Barry how to hurl lightning. Cisco uses his power to find Patty's location. Barry uses the lightning blast to turn Sand Demon's particles to glass, killing him. Patty reveals to Joe that Mark Mardon killed her father. She joins Joe's metahuman task force. Cisco divulges his ability to Stein, and convinces him not to tell anyone. Stein and Cisco are able to locate 52 breaches with the Earth-2, with the largest one being within S.T.A.R. Labs itself. Joe's estranged wife, Francine, pays him a visit. Stein collapses while talking. On Earth-2 it's revealed that the Harrison Wells of this world is alive and in charge of S.T.A.R. Labs.
26	3	"Family of Rogues"	John F. Showalter	Julian Meiojas & Katherine Walczak	October 20, 2015 (2015-10-20)	3J5653	3.47
Jay creates a device that stabilizes the singularity and will allow him to return home, but he opts to stay to help Barry stop Zoom. Meanwhile, Lisa Snart shows up asking for Flash's help in rescuing Snart, whom she believes was kidnapped. Barry tracks down Snart, who is revealed not to be kidnapped but is working with his father, Lewis. Lisa states that Snart would never work with Lewis willingly, because the latter was abusive toward her when she was a child. Eventually, the team determines that Lewis placed a bomb inside of Lisa and threatened to kill her if Snart did not help him with his theft. Barry infiltrates Lewis' crew with assistance from Snart. Cisco successfully removes the bomb from Lisa, so Snart uses his cold gun to kill his father in retaliation. Snart is incarcerated in Iron Heights and Lisa leaves. Joe reveals to Iris that Francine is alive and a former addict. Stein turns into Firestorm, but with blue flames. Earth-2's Wells arrives at the lab through the breach.
27	4	"The Fury of Firestorm"	Stefan Pleszczynski	Kai Yu Wu & Joe Peracchio	October 27, 2015 (2015-10-27)	3J5654	3.43
The team is able to temporarily stabilize Stein. Caitlin states that he needs to merge with a new person in order to survive. She identifies two potential candidates: a scientist named Henry Hewitt and a former high school football star named Jefferson Jackson. Hewitt is excited to merge with Stein, but the attempt fails and Hewitt leaves angrily, not knowing that his own metahuman powers have been activated. Jefferson initially refuses, but agrees when Hewitt goes on rampage. After the successful merger, the new Firestorm joins Barry in helping to take down Hewitt, who is incarcerated. Before departing with Jefferson, Stein encourages Cisco to tell the others about his powers. Meanwhile, Francine reveals that she is suffering from a terminal illness and only has months. Iris later confronts her for hiding the existence of the former's brother. In the meantime, Wells breaks into Mercury Labs and steals an unknown device. Later, Barry is attacked by a humanoid shark monster sent by Zoom, but is saved by Wells.
28	5	"The Darkness and the Light"	Steve Shill	Ben Sokolowski & Grainne Godfree	November 3, 2015 (2015-11-03)	3J5655	3.87
Wells, who Cisco nicknames "Harry" to distinguish him from Thawne, reveals that he is responsible for the creation of the metahumans and Zoom in Earth-2. He states that he plans to help Barry's team stop Zoom and other metahumans. At the same time, a metahuman from Earth-2 called Doctor Light arrives and starts robbing banks. Barry recognizes her as the Earth-2 version of Linda. Later, Light attempts to kill Linda and take over her identity, but accidentally kills Linda's boss and is stopped by Barry's team in the process. Harry reveals Cisco's powers to the team, which Cisco uses to locate Light. Barry defeats her with the help of Harry. After locking Light up, they plan to use her to lure Zoom out and defeat him for good. Jay, who dislikes Harry and vice versa, thinks it is too dangerous and leaves the team. Meanwhile, Barry starts dating Patty while Cisco starts a date with a barista named Kendra Saunders. Cisco picks the nickname "Vibe" for himself. Back on Earth-2, it is revealed that Zoom has Harry's daughter captive.
29	6	"Enter Zoom"	JJ Makaro	Gabrielle Stanton & Brooke Eikmeier	November 10, 2015 (2015-11-10)	3J5656	3.63
As the team works to find a way to stop Zoom, Linda-2 escapes from her containment cell. Instead, the Earth-1 Linda agrees to help the team by impersonating Linda-2. Barry reveals his alter ego to her. Harry creates a speed dampening serum and the team stages a fight at one of the breaches in order to trick Zoom through. The attempt fails, as Zoom knew the plan. Instead, he goes after Linda, before fighting Barry. Zoom is much faster and easily overpowers Barry, showing him defeated with his unconscious body to the local news and the police station before ultimately returning to S.T.A.R. Labs. Zoom stabs Barry with his hand, but Cisco shoots him with the serum, which hurts Zoom, but still leaves him with enough speed to escape. Later, Harry reveals that Zoom has his daughter, Jesse, and that he came to Earth-1 to stop Zoom. Barry wakes from his injuries and discovers that he can no longer feel his legs.
30	7	"Gorilla Warfare"	Dermott Downs	Aaron Helbing & Todd Helbing	November 17, 2015 (2015-11-17)	3J5657	3.46
Barry manages to recover from the paralysis, but is unable to use his powers due to the psychological trauma of Zoom exposing the former's defeat to the city. Iris reaches out to Henry, who returns to help Barry overcome his fears. Wells formulates a plan to close all of the breaches, except one, through which Zoom can enter into the trap set for him. Cisco touches Kendra, but leaves after seeing a winged person in a vibe. Grodd returns, using scientists to steal various chemicals in the hopes of creating more gorillas with his level of intelligence. He later kidnaps Caitlin to help him with his plan. Harry dresses up as the Reverse-Flash in order to trick Grodd into thinking that his "father" is still alive. The plan works long enough for Harry to rescue Caitlin before they both escape. After Barry is fully recovered, they lure Grodd to one of the dimensional breaches and send him to a jungle sanctuary for gorillas that have been experimented on in Earth-2. Later, Cisco meets Kendra again, this time vibing and seeing her as the winged figure.
31	8	"Legends of Today"	Ralph Hemecker	Story by : Greg Berlanti & Andrew Kreisberg Teleplay by : Aaron Helbing & Todd Helbing	December 1, 2015 (2015-12-01)	3J5658	3.94
Vandal Savage arrives in Central City, seeking to kill Kendra. Barry goes to Star City and enlists the help of Oliver and his team to protect her. The team is visited by Malcolm who informs them that Savage is an immortal. Later, Kendra is kidnapped by Hawkman, but Barry and Oliver rescue her and capture Hawkman, who introducing himself as Carter Hall, tells them he and Kendra are soulmates who have been connected for millennia. The pair are destined to die, be reborn, and find each other in each lifetime. Carter also reveals that Savage has killed the pair several times, each time growing stronger. Savage acquires the Staff of Horus, a deadly weapon. Kendra unlocks her abilities and the team decides to regroup in Central City, where Oliver witnesses Samantha Clayton with her son, who is also his. Meanwhile, Caitlin and Harry create a serum that will temporarily increase Barry's speed so that he can defeat Zoom. Jay initially refuses to test the serum, but changes his mind to save Harry when the latter is shot by an unaware Patty, whom Joe later informs about the truth. However, Jay advises against using the serum on Barry. This episode begins a crossover that continues on Arrow season 4 episode 8. The two episodes also set up Legends of Tomorrow.
32	9	"Running to Stand Still"	Kevin Tancharoen	Andrew Kreisberg	December 8, 2015 (2015-12-08)	3J5659	3.55
Mardon breaks James Jesse and Snart out of Iron Heights in an effort to team up to kill the Flash. Snart declines and alerts Barry. Jesse and Mardon place bombs hidden in Christmas gifts throughout the city, threatening to set them off in family homes if Barry does not sacrifice himself. Wells, Cisco, and Jay find one of the bombs and alter its magnetic polarity; they send it into one of the dimensional breaches, which causes it to attract the remaining bombs, removing them from the city. With them gone, Barry subdues Mardon and Jesse, dissuading Patty from killing Mardon. Meanwhile, Iris and Barry tell Joe about the latter's son named Wally, who later shows up at Joe's. Caitlin and Jay start a romantic relationship. Elsewhere, Zoom is revealed to be sending metahumans in order to help Barry get faster so that the former can take the latter's speed force, which Harry reluctantly agrees to help Zoom with because of his daughter, Jesse.
33	10	"Potential Energy"	Rob Hardy	Bryan Q. Miller	January 19, 2016 (2016-01-19)	3J5660	3.41
Cisco presents a new idea to slow Zoom down, telling the team about a metahuman, whom he has dubbed the "Turtle", who has the ability to stop the kinetic energy around him and slow everyone to a halt. After Barry fails to stop the Turtle, identified as Russell Glosson, at a diamond unveiling, the team sets a trap at an art exhibit. Barry invites Patty with the intention of telling her his secret, but Glosson is aware of the trap and almost kills Patty before escaping. Later, Glosson kidnaps Patty. The team tracks him down and Barry is able to generate enough speed to move through the kinetic waves to knock him unconscious and save Patty. Patty tells Barry that she is leaving Central City and Harry kills Glosaon by extracting a portion of his brain matter. Meanwhile, Joe struggles to develop a relationship with Wally, who has been street racing in an attempt to earn enough money for Francine's medical bills. Caitlin discovers that Jay is dying of an illness caused by Zoom stealing his speed. They vow to stop Zoom to get Jay's speed back in order to cure Jay.
34	11	"The Reverse-Flash Returns"	Michael A. Allowitz	Aaron Helbing & Todd Helbing	January 26, 2016 (2016-01-26)	3J5661	3.71
The team discovers Turtle's death and Jay suspects Harry. Cisco asks Harry for help in controlling his vibing abilities. The latter determines they are connected to Cisco's fear response and triggers a vibe which alerts the team that Eobard Thawne is back. Harry surmises that this version of Thawne is from a point in the future before he went back in time to kill Nora and was protected from being erased. Cisco has a vibe of the future, and the team learns that Thawne is planning to use tachyons to return to his time. Barry arrives and destroys the machine. After a race around the city, Barry stops Thawne and imprisons him at the particle accelerator. However, his capture causes a rupture in the timeline that threatens to kill Cisco, so Barry sends Thawne back to the future to save his friend. Meanwhile, Patty discovers Barry is the Flash but, when he refuses to acknowledge it, she chooses to leave the city. Iris learns that Francine's death is imminent and reconciles with her. Wally takes her advice to do the same.
35	12	"Fast Lane"	Rachel Talalay	Story by : Brooke Eikmeier Teleplay by : Kai Yu Wu & Joe Peracchio	February 2, 2016 (2016-02-02)	3J5662	3.66
Right before the particle accelerator explosion, Joey Monteleone was thrown into a tar pit and left for dead. Sealed away, he is freed two years later with the ability to turn his body into molten tar. He sets out to get revenge on those who attempted to kill him. Harry creates a device to siphon Barry's speed energy and attaches it to his suit. It steals a portion of Barry's speed. Wells gives the energy to Zoom, who demands the rest. Meanwhile, Wells and Barry also successfully find a way to close the breaches. While going after Joey, Iris is injured when Barry is too slow to save her. Wells tells the team about the device, asking to be returned to Earth-2 and have Barry seal the breaches so Zoom cannot re-enter. After stopping Joey, Barry informs Wells that the team will help the latter to save Jesse. In the meantime, Wally continues racing even after Francine's death.
36	13	"Welcome to Earth-2"	Millicent Shelton	Story by : Greg Berlanti & Andrew Kreisberg Teleplay by : Katherine Walczak	February 9, 2016 (2016-02-09)	3J5663	3.96
Before heading to Earth-2, Barry closes all but one of the breaches, which is at S.T.A.R. Labs. Using the last breach, Barry, Cisco, and Harry travel to Earth-2, but an energy surge destabilizes the breach and the trio get stuck in Earth-2. Barry decides to impersonate his doppelgänger to get more information on Zoom. He later meets the Iris and Joe of Earth-2 and learns that Iris, who is his doppelgänger's wife, works for the CCPD while Joe is a singer. Barry is attacked by Earth-2's Caitlin and Ronnie, known as Killer Frost and Deathstorm respectively. Joe is killed in the attack. Cisco attempts to help the police stop the pair, but is confronted by his own evil doppelgänger, known as "Reverb" and revealed to have greater powers, including control over nervous systems and manipulation of vibrations. Barry arrives and is stopped by Reverb and Deathstorm. Zoom arrives, kills Reverb and Deathstorm for harming the Flash, and then imprisons Barry. Meanwhile, a new metahuman named Adam Fells appears in Earth-1 Central City. Jay tells Caitlin that he invented Velocity-6, which is the real reason why he lost his speed. Caitlin develops Velocity-7, which Jay uses to engage Fells, who escapes.
37	14	"Escape from Earth-2"	JJ Makaro	Story by : Todd Helbing & Aaron Helbing Teleplay by : David Kob	February 16, 2016 (2016-02-16)	3J5664	3.90
On Earth-2, Zoom issues a demand to Central City to turn Wells in. The former attacks S.T.A.R. Labs to find Wells and Cisco; but the two escape with Barry-2. The trio updates Iris-2 on what happened with Barry-1. They decide to convince Caitlin-2 to help. After a fight, Caitlin-2 agrees to take the team to Zoom. They arrive and rescue Barry-1 and Jesse, but Zoom shows up too. They are able to escape by the help of Caitlin-2, who keeps Zoom frozen and unable to move, but a third unidentified prisoner, who tries to reveal something about Jay, is left behind. Barry-2 and Iris-2 leave Central City to hide from Zoom. Meanwhile on Earth-1, Caitlin-1 creates "Velocity 9", which Jay uses to stop Adam, who gets incarcerated in Iron Heights. Caitlin-1 discovers that Velocity 9 can cure Jay. The latter, Caitlin, Iris and Joe stabilize the breach and allow Barry-1, Cisco, Harry, and Jesse to return, but Zoom stabs his arm through Jay and pulls him back through the closing breach to Earth-2.
38	15	"King Shark"	Hanelle Culpepper	Benjamin Raab & Deric A. Hughes	February 23, 2016 (2016-02-23)	3J5665	3.80
While everyone tries to move on, the humanoid shark-monster that Harry stopped, known as "King Shark," escapes A.R.G.U.S. custody and heads for Central City to kill the Flash. John Diggle and Lyla Michaels, the new director, arrive to warn Barry. King Shark, later identified as Shay Lamden, shows up at Barry's home looking for the Flash, tracking Barry's electrical field. A.R.G.U.S. arrives and forces Shay to retreat. Later, Barry forces King Shark to chase him out on the water, where the former creates an electrified underwater cyclone that subdues the latter, and allows A.R.G.U.S. to imprison him again, with Lyla planning to find a cure. Barry vows to open a breach back to Earth-2 to stop Zoom. Meanwhile, Barry and Wally find it hard to develop a relationship. After Caitlin becomes cold due to Jay's death, Cisco becomes scared that she will become Killer Frost; but she assures him that she is only dealing with her grief. Back on Earth-2, it is revealed that, underneath his mask, Zoom looks exactly like Jay.
39	16	"Trajectory"	Glen Winter	Lauren Certo & Lilah Vandenburgh	March 22, 2016 (2016-03-22)	3J5666	3.00
Barry starts training to get faster so that he can stop Zoom. While out with friends at a club for downtime, Barry and the other club patrons are robbed by an unknown speedster, who then escapes. The speedster turns out to be Eliza Harmon, a Mercury Labs employee who developed Velocity-9 from samples Caitlin gave her to help with Jay's illness. Operating under the alias "Trajectory", Harmon invades S.T.A.R. Labs, imprisons Barry, and demands more V-9. After she threatens Jesse's life, Wells and Caitlin make more of the drug for Harmon, who then speeds off to wreak havoc on the city. Barry manages to stop her before she injects more V-9 into her system. Barry watches as Harmon's speed becomes so intense that her lightning turns blue and she disintegrates. Jesse decides to leave the city to experience the world on her own and stop Wells from doing harmful things just to protect her. Based on what Barry saw from the overuse of V-9, the similarities between Zoom's speed and Jay's sickness, and Cisco's "vibe", the team concludes that Jay is Zoom.
40	17	"Flash Back"	Alice Troughton	Aaron Helbing & Todd Helbing	March 29, 2016 (2016-03-29)	3J5667	3.39
Barry travels back in time to when Hartley Rathaway attacked the team, and switches places with his past self, in order to have Thawne help him solve the Speed Force equation. However, after a Time Wraith follows Barry to the past, Thawne deduces Barry's deception. Barry is able to convince Eobard to help the former become faster. The wraith comes to the lab, where Caitlin and Cisco are forced to accept help from Hartley to deter the wraith. Afterward, the Barry from the current time arrives, forcing an explanation of the time travel event. Thawne provides the future Barry with the information about the tachyon technology, so that he can return to his time. As Barry prepares to make the jump through time, the Wraith arrives, forcing the past timeline's Barry to intervene, so that his future self can return. Back in his time, Barry is confronted by the Wraith, but a reformed Hartley arrives with his sonic gauntlets and defeats the wraith. Barry gives Iris a footage of Eddie recorded in the alternate timeline, advising her to move on with her life.
41	18	"Versus Zoom"	Stefan Pleszczynski	Joe Peracchio & David Kob	April 19, 2016 (2016-04-19)	3J5668	3.03
Years earlier on Earth-2, a young Hunter Zolomon watches as his father murders his mother and is subsequently sent to an orphanage. In present day, Barry tests the tachyon accelerator and is able to enhance his speed four times greater than normal. Barry decides to re-open a breach back to Earth-2, and he believes that Cisco's powers are the key to opening the portals. Meanwhile Caitlin reveals that Jay's Earth-1 doppelgänger is Zolomon and Wells, shocked to hear this, reveals that Earth-2 Zolomon was a convicted serial killer. Zolomon was receiving electroconvulsive therapy during the explosion, and was one of the many affected. With this revelation, the team confirms that "Jay" is Hunter. Cisco opens a breach, and Zoom immediately appears, chasing Barry back to S.T.A.R. Labs. There, Barry uses images of Zolomon's parents as a distraction to trap him, but Hunter escapes, claiming to be "the darkness". Zolomon kidnaps Wally and demands Barry's speed in exchange for Wally's life. Barry agrees, so Wells siphons all of his speed force, leaving Barry powerless. Zolomon injects the speed force into himself, and he kidnaps Caitlin with his enhanced speed before escaping.
42	19	"Back to Normal"	John F. Showalter	Brooke Roberts & Katherine Walczak	April 26, 2016 (2016-04-26)	3J5669	3.39
As Barry adjusts to life without his powers, Wells decides to leave the lab to look for Jesse. Shortly after speaking with her, Wells is attacked and kidnapped by Griffin Grey, believing him to be Thawne, who demands that Wells find a cure for his metahuman abilities. Grey has superhuman strength, but is also aging rapidly. Barry discovers that, when Grey uses his super strength, he accelerates the aging process. Barry, Joe, Cisco and Jesse manipulate Grey into exerting his powers until he ages and dies as a weak, old man; his body then reverts back to its 18-year-old self. To fight Zoom, Wells offers to recreate the circumstances that gave Barry his speed. Meanwhile on Earth-2, Zolomon tells Caitlin that he kidnapped her because he is in love with her. Caitlin encounters her doppelgänger, Killer Frost, who was captured by Zolomon as a reminder of Caitlin. Killer Frost convinces Caitlin to help her escape, but then attempts to kill her. Zoom arrives and kills Killer Frost, then warns Caitlin not to free the man in the iron mask. Later, Hunter decides to conquer the other Earths in the multiverse and takes Caitlin with him back to Earth-1.
43	20	"Rupture"	Armen V. Kevorkian	Kai Yu Wu & Lauren Certo	May 3, 2016 (2016-05-03)	3J5670	3.34
While Barry keeps declining Harrison's offer, the team rigs a hologram of the Flash to stop crime around the city so that no one will know the truth. Henry returns to Central City and joins the team. He argues with Wells on the safety of another explosion. Hunter and Caitlin arrive back on Earth-1 with the former declaring the city under his control. Iris confesses her feelings to Barry. The Earth-2 version of Dante Ramon, called "Rupture," arrives on Earth-1 looking to kill Cisco, believing that Cisco killed his Earth-2 brother. Zolomon sends Dante-2 after the police to send the city a message. Barry and the police stop Dante-2, but Zolomon arrives and kills the officers himself, as well as Dante-2 for failing. He then publicly announces the Flash's disappearance. Cisco and Dante-1 become closer. Barry finally agrees to Harrison's plan. During the process, Barry is seemingly vaporized, while Jesse and Wally are caught in the blast.
44	21	"The Runaway Dinosaur"	Kevin Smith	Zack Stentz	May 10, 2016 (2016-05-10)	3J5671	3.52
Wally regains consciousness, but Jesse remains in a coma. Cisco has a vibe of Barry and realizes that he is still alive and in the Speed Force. Barry meets physical manifestations of the Speed Force in faces familiar to him. The Speed Force informs Barry that he cannot leave unless he catches a mysterious moving figure, thus gaining his speed back. Cisco and Wells create a path into the Speed Force so Barry can escape, but the latter chooses to remain so he can earn his powers back. The Speed Force tells Barry that he cannot become the Flash again until he finally accepts Nora's death. Barry shares a moment with the physical manifestation of Nora, which allows him to finally catch the moving figure himself. With his powers restored and help from Cisco and Iris, Barry returns to S.T.A.R. Labs in time to save the team from the reanimated corpse of Tony Woodward. Afterwards, Barry uses a bit of speed force energy to bring Jesse out of her coma. Across town, Zolomon has assembled an army of metahumans from Earth-2, planning to unleash them on Central City.
45	22	"Invincible"	Jesse Warn	Story by : Greg Berlanti & Andrew Kreisberg Teleplay by : Brooke Roberts & David Kob	May 17, 2016 (2016-05-17)	3J5672	3.37
Caitlin returns to the team, but not without emotional trauma from being kidnapped. Zoom's army wreaks havoc across the city. Barry puts out several fires and takes out some of the metahumans to help the police. Back at S.T.A.R. Labs, Barry displays a level of confidence in stopping Zoom that concerns the team and each of them attempts to convince him to be more cautious. Among the attackers is Laurel Lance's doppelgänger, "Black Siren", who attacks various buildings around Central City using sonic blasts. Wally begins taking on metahumans trying to repay the Flash for saving him. The team creates a sonic amplifier tuned to the frequency of Earth-2. They discharge it and render all Earth-2 natives unconscious, allowing Barry to apprehend them all at once, although Zoom survives by escaping to Earth-2. Meanwhile, Cisco begins having vibes of a future Earth-2 being destroyed. Barry convinces Joe to let Wally be a hero. Later, Zoom returns and kidnaps Henry in front of the team. Barry races after them, revealing his identity to Wally, and is forced to watch Zoom kill Henry.
46	23	"The Race of His Life"	Antonio Negret	Aaron Helbing & Todd Helbing	May 24, 2016 (2016-05-24)	3J5673	3.35
Zolomon manages to escape Barry by creating a time remnant. After Henry's funeral, Hunter challenges Barry to a race to determine who is faster, threatening to kill everyone Barry loves if he refuses. Harrison discovers Hunter is in possession of a magnetar, a device that will destroy every planet in the Multiverse except Earth-1 which requires both their speeds to power. When an enraged and vengeful Barry refuses to back out, the team locks him in the pipeline and forces Zolomon back to Earth-2 themselves; but Hunter abducts Joe in the process. Wally discovers this and frees Barry, who agrees to Zolomon's race. As Barry races Zolomon around the magnetar, he creates a time remnant of himself who frees Joe and destroys the machine, but at the cost of his life. The "prime" Barry defeats Zolomon, who is then taken away by Time Wraiths for his crimes against the timeline. Barry rescues the man in the iron mask, who is revealed to be the real Jay Garrick, Henry's Earth-3 doppelgänger. Wells and Jesse return to Earth-2 with Jay, who plans to return to Earth-3 from there. Barry, still feeling broken and defeated, travels back in time and stops Thawne from killing Nora.

Season 3 (2016–17)

No. overall	No. in season	Title	Directed by	Written by	Original air date	Prod. code	U.S. viewers (millions)
47	1	"Flashpoint"	Jesse Warn	Story by : Greg Berlanti & Andrew Kreisberg Teleplay by : Andrew Kreisberg & Brooke Roberts	October 4, 2016 (2016-10-04)	T27.13101	3.17
After preventing the murder of Nora Allen, Barry returns with Eobard Thawne to the present and imprisons him in a cage that dampens his speed. In the new timeline, which Thawne dubs "Flashpoint", both of Barry's parents are alive; Joe has a poor relationship with Wally and Iris and is chronically in trouble at work; Cisco is a billionaire tech magnate; and Caitlin is a pediatric ophthalmologist. There is also a new Flash in Central City called Kid Flash struggling with his own nemesis, Edward Clariss, known as "The Rival". Barry begins losing his memories of the original timeline due to the new timeline becoming permanent. After discovering Kid Flash is Wally, Barry teams up with him and stops Clariss, but Wally is critically injured in the process. Realizing that the new timeline is worse for those closest to him, Barry is forced to let Thawne return to the past and kill Nora, resetting the timeline and restoring Barry's memories. Back in the present, Barry learns that the timeline did not reset exactly. Meanwhile, Clariss is confronted by a mysterious voice and finds the message "Alchemy" being scratched into his mirror by an invisible force.
48	2	"Paradox"	Ralph Hemecker	Aaron Helbing & Todd Helbing	October 11, 2016 (2016-10-11)	T27.13102	2.80
Barry learns of multiple changes to the timeline: Iris has not forgiven Joe for concealing that her mother was alive, Cisco is angry with him for not altering the timeline to save his brother Dante from being killed, and he has a new CSI partner, Julian Albert, who does not like or trust him. Barry decides to travel back to fix the damage, but he is intercepted by Jay Garrick. Jay tells Barry that the timeline never resets exactly and he has to learn to live with his mistakes. Meanwhile, Clariss has visions of "Flashpoint" and locates the person responsible, Alchemy, who restores Clariss' powers and full "Flashpoint" memories. Barry tells the team about the timeline's alterations before confronting Clariss at an abandoned warehouse. Alchemy is there as well, saying that he is preparing for a future event. Cisco arrives and helps Barry defeat Clariss, who is then incarcerated in Iron Heights. The team determines Alchemy is creating other metahumans from "Flashpoint" whom they need to track down. Cisco and Barry reconcile, as do Iris and Joe. Caitlin is secretly revealed to have gained cryokinetic powers. Barry and Iris begin dating, while Clariss is confronted by the voice of Alchemy for his failure before being killed inside his cell by an unidentified metallic being.
49	3	"Magenta"	Armen V. Kevorkian	Judalina Neira & David Kob	October 18, 2016 (2016-10-18)	T27.13103	2.67
Wells and Jesse return to Earth-1, where she reveals she has gained super speed from the second dark matter blast. Wells hopes everyone will dissuade her from using her powers. Elsewhere, foster child Frankie Kane develops metahuman magnetic powers that manifest as an alternate personality, Magenta, who attacks her abusive foster father. Julian confronts Frankie at the station and is nearly killed by Magenta. Barry learns from Magenta that she got her powers from Alchemy. She escapes and later goes to the Central City Hospital to kill her foster father by dropping an oil tanker on the building. Barry creates a vortex to hold the tanker in place, but is unable to confront Magenta simultaneously. Wells sends Jesse to help. She takes over the vortex while Barry talks Kane into gaining control over Magenta. Wally, grappling with disappointment over having no speed, realizes he is having the same dreams from "Flashpoint" that Kane describes. Wells tells Jesse that he will support her decision and presents her with her own speedster costume. Joe later shows Barry and Julian footage of Clariss being killed in his cell by an unseen force, manifesting only as a flying ball of white light.
50	4	"The New Rogues"	Stefan Pleszczynski	Benjamin Raab & Deric A. Hughes	October 25, 2016 (2016-10-25)	T27.13104	2.80
Three years ago, Sam Scudder and Rosalind Dillon, former cohorts of Leonard Snart, were caught in the original particle accelerator explosion. In the present, Barry begins training Jesse on how to use her powers. Wells suggests the team locate a doppelgänger of his from another Earth to replace him on the team once he and Jesse leave. Scudder returns from being trapped in a mirror-like dimension with the ability to transport himself and others through reflective surfaces. He reunites with Dillon, who now has vertigo-inducing powers, and they go on a crime spree. Barry and Jesse (as "Jesse Quick") confront them, but are defeated after Barry ends up trapped inside a mirror by Scudder. Caitlin secretly uses her emerging ice powers to help Barry free himself from his predicament. He and Jesse then successfully capture Scudder and Dillon. After evaluating the candidates, the team recruits the friendly and eccentric Wells of Earth-19, despite the Earth-2 Wells' misgivings. Jesse and her father then return to Earth-2, but not before Wells apprises Cisco of Barry's suspicious escape. That night, Caitlin accidentally freezes the water in her shower and her appearance begins showing signs of her Earth-2 doppelgänger, Killer Frost.
51	5	"Monster"	C. Kim Miles	Zack Stentz	November 1, 2016 (2016-11-01)	T27.13105	2.77
Without informing the others, Caitlin visits her estranged mother, Carla, at her medical research company to have her powers examined, but leaves after viciously attacking another scientist who intended to exploit her condition. Meanwhile, a gigantic creature repeatedly appears and disappears on the streets of Central City. Cisco grows suspicious of the newly-recruited "H.R." Wells when he does not provide much help in battling the monster. The monster is revealed to be simply a hologram operated by a bullied 15-year-old boy wanting to create fear in others. Barry exposes the deception in time to keep police snipers from harming civilians and prevents Julian from shooting the boy, whom he mistakes for a metahuman. H.R. is revealed to have no technical knowledge at all. He admits that he is only an "idea man" for his tech company on Earth-19 and that he came to Earth-1 primarily to get material for a novel. The team decides to give him a chance to prove his worth as an assistant. A badly shaken Julian reconciles his differences with Barry. Carla informs Caitlin that her powers are increasing and that she needs to stop using them or her condition will become irreversible.
52	6	"Shade"	JJ Makaro	Emily Silver & David Kob	November 15, 2016 (2016-11-15)	T27.13106	3.01
When Wally relates his recent dreams of being Kid Flash, Barry reveals what happened to him during "Flashpoint." A metahuman H.R. nicknames "Shade" appears and murders a stockbroker. Caitlin reveals her powers to Cisco and has him "vibe" her to learn her future. Cisco sees himself fighting Killer Frost, causing Caitlin to contemplate leaving for good. Alchemy summons Wally to him, so the team locks Wally in the particle accelerator for his own safety. Meanwhile, Barry and the others stop Shade's next attack and capture him. Cisco tells everyone the truth about Caitlin and Barry privately confesses to her that her powers are a result of "Flashpoint." Wally volunteers to lead the team to Alchemy to capture the villain and stop the memories, which are causing him pain. Barry, Joe, and a S.W.A.T. team locate Alchemy and his followers and surround them. The metallic being that killed Clariss appears and attacks them, revealing himself to be a speedster that only Barry can see. As Barry fights their attacker, Alchemy entices Wally to pick up his fallen energy weapon, which encases Wally in a crystal cocoon. Calling himself "Savitar", the speedster overpowers Barry and prepares to stab him with a blade from his arm.
53	7	"Killer Frost"	Kevin Smith	Story by : Judalina Neira Teleplay by : Andrew Kreisberg & Brooke Roberts	November 22, 2016 (2016-11-22)	T27.13107	2.95
Savitar opts to drag Barry across the city, while battering him to demonstrate his superiority. Cisco and Caitlin arrive to rescue Barry and Savitar flees. Caitlin, with her Killer Frost persona having taken over, violently interrogates one of Alchemy's followers at CCPD headquarters. When Julian catches her, she coerces him to find the other acolytes so they can lead her to Alchemy, who can presumably remove her powers. Barry and Cisco track her down and imprison her, but the team is fractured after she reveals Barry's role in Dante's death by creating "Flashpoint." Greatly concerned and disregarding the consequences, Joe breaks Wally out of the cocoon. Wally emerges with unmanageable speed powers and he races away in a confused state. Barry offers his life to Caitlin for her freedom in a successful attempt to restore her sanity and gain her help in treating Wally. Joe and Barry locate Wally, stabilizing his condition with Caitlin's serum, and Wally soon embraces his new abilities. Julian agrees to protect Caitlin from the police, but forces Barry to resign from the CCPD in exchange, believing him morally unfit for wanting Caitlin shielded. Julian is later revealed to be Alchemy, unwillingly working for Savitar.
54	8	"Invasion!"	Dermott Downs	Story by : Greg Berlanti & Andrew Kreisberg Teleplay by : Aaron Helbing & Todd Helbing	November 29, 2016 (2016-11-29)	T27.13108	4.15
Barry investigates a meteor crash outside Central City that turns out to be a spaceship from which aliens emerge. Lyla tells the team that the "Dominators" landed previously in the 1950s, but then mysteriously departed. Needing help, Barry assembles the original Team Arrow, Thea, the Legends, and Supergirl of Earth-38. The team begins training at a S.T.A.R. Labs facility, sparring against Supergirl to prepare for combat against the aliens. Cisco reveals a message to Rip Hunter from Barry's future self, which exposes Barry's manipulation of the timeline and how it affected other team members. Oliver, Supergirl, Felicity, Martin, and Jefferson are left as the only ones who still trust Barry. The Dominators abduct the President. Supergirl leads most of the others in a rescue effort, but the Dominators kill the President and ensnare everyone with a mind control device. The controlled heroes return and attack S.T.A.R. Labs. While Oliver holds them off, Barry lures Supergirl to the device and manipulates her into destroying it, freeing everyone. The team decides to trust Barry again. Suddenly, Sara, Ray, Diggle, Thea, and Oliver are teleported away before Barry can intervene. This episode begins a crossover that continues on Arrow season 5 episode 8 and concludes on Legends of Tomorrow season 2 episode 7.
55	9	"The Present"	Rachel Talalay	Story by : Aaron Helbing & Todd Helbing Teleplay by : Lauren Certo	December 6, 2016 (2016-12-06)	T27.13109	3.14
Barry asks Jay Garrick for help against Savitar. The two heroes locate and defeat Alchemy and return his weapon to its box, causing Savitar to disappear before he can kill Jay. Discovering Julian to be Alchemy, Barry reveals his own identity to him to get further information. Julian relates how he located the Philosopher's stone following a vision of his dead sister and that he has been having blackouts ever since. Savitar manifests through Cisco using visions of Dante and fights Barry and Wally, but Caitlin manages to convince Cisco to close the box again. The team communicates with Savitar through Julian, who claims that Barry, in the future, will imprison him. He also says that one teammate will betray them, another will fall, and a third will suffer a fate worse than death. Trying to end Savitar's threat, Barry and Jay throw the box into the Speed Force but, in the process, Barry is thrown five months into the future and witnesses Savitar killing Iris. Jay tells Barry that the future is not fixed. Wally is given his own "Kid Flash" costume, Julian gets Barry's job back for him, and Barry rents a new apartment for himself and Iris.
56	10	"Borrowing Problems from the Future"	Millicent Shelton	Grainne Godfree & David Kob	January 24, 2017 (2017-01-24)	T27.13110	2.72
Barry has been having nightmares about Iris's murder. Jared Morillo attempts a robbery, but is confronted by Barry, who recalls a news report during his visit in the future when the latter captures the former. The distraction allows Morillo to overpower Barry and escape. H.R. launches the museum, but no one visits it. In a second confrontation, Wally intervenes and captures Morillo, gaining praise by everyone except Barry. He eventually reveals the future he saw to everyone but Joe. The team decides to change the course of other events in order to prevent Iris's death. Using Cisco, Barry accesses the future memory, in which the news reveal that the S.T.A.R. Labs museum will close and Caitlin will become Killer Frost. Morillo escapes, and Barry decides to change the first event by letting Wally capture him. Cisco relaunches the museum, starting with an exhibition for elementary school students. Julian is persuaded by Caitlin to join the team. A mysterious woman from another Earth arrives, searching for H.R.
57	11	"Dead or Alive"	Harry Jierjian	Story by : Benjamin Raab & Deric A. Hughes Teleplay by : Zack Stentz	January 31, 2017 (2017-01-31)	T27.13111	3.06
An Earth-19 bounty hunter named Gypsy, possessing powers similar to Cisco's, arrives on Earth-1 intending to take H.R. back to Earth-19 for trial and execution, as inter-dimensional travel is forbidden there. Cisco demands a trial by combat for H.R.'s life, which she accepts. As the duel is to the death, Barry and H.R. try to ambush Gypsy to save Cisco, but she easily defeats them. Meanwhile, determined to leave a legacy, Iris persuades Wally to help her bust an arms dealer. While he is out scouting, she confronts the dealer, seemingly unafraid of death. Wally manages to save her. Julian discovers a flaw in Gypsy's fighting style. Cisco exploits this weakness during their battle, which allows him to defeat her. Cisco spares Gypsy's life, but she makes it clear that H.R. can never return to Earth-19, since she will state that she killed him. Joe gets angry with Iris and is suspicious of her lack of fear. Barry plots to have Wally increase his speed so that Wally can save Iris from Savitar.
58	12	"Untouchable"	Rob Hardy	Brooke Roberts & Judalina Neira	February 7, 2017 (2017-02-07)	T27.13112	2.91
Barry and Wally continue their training in order to save Iris from Savitar. They race against each other, and Barry wins by phasing through a building. Julian finds a decayed corpse that was murdered just eight hours ago. He informs Joe that this is surely the work of a metahuman. The body is taken to S.T.A.R. Labs for investigation, where Caitlin and Julian observe it turning to ash. Iris confesses to Barry that she is afraid of her future. The meta responsible for the disintegrated corpse attacks Joe and is revealed to be targeting the police who arrested him in Flashpoint. The metahuman tries to disintegrate a bridge on the train Joe is on, forcing Barry to phase the train through the wreckage of the bridge. Barry teaches Wally how to phase, which Wally uses to expose the meta to his blood and strip him of his powers. Joe insists that everyone be honest with him from now on after learning of Iris's future death. While practicing phasing, Wally is shocked to see Jesse coming through a portal. Jesse says her father has been abducted by Grodd and taken to Gorilla City.
59	13	"Attack on Gorilla City"	Dermott Daniel Downs	Story by : Andrew Kreisberg Teleplay by : Aaron Helbing & David Kob	February 21, 2017 (2017-02-21)	T27.13113	2.78
Earth-2 Wells is captured while running through the woods. Jesse explains that he was leading an expedition to Gorilla City that was ambushed and killed while Wells disappeared. Barry recalls that in the future Central City will be attacked by gorillas. He, Julian, Cisco, and Caitlin go to rescue him but are captured by Grodd. Speaking through Wells, Grodd asks Barry to help him usurp his master Solovar. Barry agrees to fight Solovar in the arena for the lives of the others and wins, but refuses to kill him. Grodd seizes control of Gorilla City and prepares an invasion of Earth-1. The team asks Caitlin to kill Cisco so Grodd can't open a portal, but she refuses. Barry fakes his death and Grodd removes him from his cage. He resuscitates himself and frees the others, and they return to Earth-1. Jesse and her father reunite and Wally and Jesse recommit to their relationship. Julian asks Caitlin out on a date. Grodd assembles his army with a brainwashed Gypsy at his side.
60	14	"Attack on Central City"	Dermott Daniel Downs	Story by : Todd Helbing Teleplay by : Benjamin Raab & Deric A. Hughes	February 28, 2017 (2017-02-28)	T27.13114	2.87
Harry and H.R. clash over their different personalities. Jesse informs her father that she intends to stay on Earth-1 with Wally, which Harry initially tries to prevent. Harry subdues Gypsy when she ambushes Cisco and Barry, and the team realizes that Grodd and his forces have reached Central City. Using his powers, Cisco determines that the gorillas will attack the center of town. This turns out to be a distraction for Grodd to abduct a visiting Army general. Barry contemplates killing Grodd as the only way to permanently stop him and also change the future, but Harry encourages him to find another way. Taking control of the general, Grodd attempts a nuclear missile strike on the city. Barry prevents the attack, so Grodd and his gorilla army invade the city themselves. Cisco travels to Earth-19 to ask Gypsy for help. The speedsters distract the soldiers while Cisco and Gypsy bring Solovar to Earth-1, who defeats Grodd and assumes leadership once again. All the gorillas return to Earth-2, with the exception of Grodd, who is turned over to A.R.G.U.S. Gypsy kisses Cisco before telling him he couldn't handle her, then returns to Earth-19. Barry proposes to Iris. While going out to pick up dinner for Jesse, Wally is confronted by Savitar.
61	15	"The Wrath of Savitar"	Alexandra La Roche	Andrew Kreisberg & Andrew Wilder	March 7, 2017 (2017-03-07)	T27.13115	2.52
Wally continues having visions of Savitar and, after a physical altercation with him, finally admits this to the team. The team attempts to question Savitar via Julian, who again acts as a conduit. Savitar casts doubt on whether the Philosopher's Stone is truly lost to the Speed Force. Caitlin confesses that she kept part of the Philosopher's Stone, hoping to use it to remove her powers. Barry and the team figure out that Savitar is trapped inside the Speed Force but Wally is at home with Jesse when they realize this. Wally, after being confronted by Savitar who appears as a vision of his mother, steals the stone fragment from the lab, creates a portal, and launches the fragment into the Speed Force, believing this will exile Savitar for good. Barry arrives just as the portal draws Wally into it, trapping him in the Speed Force. Savitar, having successfully manipulated Wally, emerges from the Speed Force and fights Barry, taunting him by boasting he will not kill him before Barry watches Iris die before his eyes. Barry breaks off Savitar's arm blade using his vibrating hand, causing Savitar to retreat.
62	16	"Into the Speed Force"	Gregory Smith	Brooke Roberts & Judalina Neira	March 14, 2017 (2017-03-14)	T27.13116	2.39
Feeling responsible for everything bad that is happening, and that Wally is suffering inside the Speed Force, Barry decides to rescue him. Cisco vibes Barry into the Speed Force, where he encounters manifestations of friends and foes who had previously sacrificed their lives. Less accommodating than before, they push Barry to understand true sacrifice and that he must be the one to save Iris in the future. Barry is also confronted by his former enemy, Hunter Zolomon, and defeats him. Jay Garrick, having been contacted by Cisco, joins Barry inside the Speed Force and voluntarily takes Wally's place so Barry and Wally can escape. Meanwhile, Jesse uses the armor shard to locate and face Savitar by herself, managing to wound the villain with it before he escapes. Later, Jesse decides to go to Earth-3 to protect it until the team can free Jay from the Speed Force. Barry admits to Iris that even though he does love her but proposed for the wrong reasons and suggests they take some time apart from one another.
63	17	"Duet"	Dermott Daniel Downs	Story by : Greg Berlanti & Andrew Kreisberg Teleplay by : Aaron Helbing & Todd Helbing	March 21, 2017 (2017-03-21)	T27.13117	2.71
J'onn J'onzz and Mon-El arrive on Earth-1 with a comatose Kara. The Music Meister attacks and places Barry in a similar coma. He wakes up in a musical world and finds Kara. Meister tells them that if they follow the script, they will return to the real world. Barry and Kara are forced to work as singers in a nightclub run by Malcolm, with Winn working as a piano player, Cisco as a waiter and Stein and Joe as two gangsters opposing Malcolm. Barry and Kara find Malcolm's son, Mon-El, and Stein's and Joe's daughter, Iris, in a forbidden relationship. Kara and Barry convince the pair to reveal their love, also helping Barry and Kara to realize their own mistakes. Malcolm, Stein and Joe subsequently decide to go to war. Barry and Kara are shot in the crossfire, but the real Cisco, Mon-El and Iris vibe into their world to save them, allowing Barry and Kara to admit their loves for Iris and Mon-El. They wake up in S.T.A.R. Labs; and Meister reveals that he just wanted them to realize their love. Kara's team returns to Earth-38; and Barry and Iris move back in together. He re-proposes to Iris, who accepts. This episode is a crossover with Supergirl.
64	18	"Abra Kadabra"	Nina Lopez-Corrado	Story by : Andrew Kreisberg Teleplay by : Brooke Roberts & David Kob	March 28, 2017 (2017-03-28)	T27.13118	2.39
Abra Kadabra, a criminal from the 64th century, comes to Central City, stealing from numerous tech companies and killing two guards. Gypsy returns, in pursuit of Kadabra, to avenge her partner. Kadabra offers the team the identity of Savitar in exchange for his freedom. Against Gypsy's wishes, a desperate Joe releases Kadabra, who escapes to Thawne's time vault after Gypsy fails to stop him, and retrieves a power source. Kadabra also triggers an explosion that critically injures Caitlin. Refusing to take off the necklace suppressing her powers, even though doing so could save her life, Caitlin asks Julian to perform surgery with her guidance instead. Kadabra attempts to return to his own time, having used the stolen technology to build his own time machine, but he is foiled by the team with Gypsy's help. Barry decides that the only way to save Iris' life is by traveling to the future. Later, a still-recovering Caitlin loses consciousness and begins convulsing, before her vital signs flatline. A distraught Julian rips the necklace from her neck and her vital signs return to normal, as her injuries heal rapidly. She awakens, but in the guise of Killer Frost, before vanishing in a cloud of ice.
65	19	"The Once and Future Flash"	Tom Cavanagh	Carina Adly MacKenzie	April 25, 2017 (2017-04-25)	T27.13119	2.67
Killer Frost destroys the necklace and escapes. Barry travels to 2024, when he learns that Cisco lost his powers after Killer Frost, who allied with Savitar, shattered Cisco's hands and forced him to use mechanical prosthetics; H.R. became a successful novelist; Julian works at Iron Heights tending to Killer Frost; Wally is catatonic with a shattered spine; Joe is depressed and bitter; future Barry is a recluse hiding in S.T.A.R. Labs; and in his absence, Scudder and Dillon have taken over Central City. Barry fails to learn Savitar's identity. Cisco secretly uses a device to prevent Barry from returning to the past, hoping he will put things right. Barry rounds up Julian, Joe and H.R. and reunites Team Flash. Scudder and Dillon overwhelm Barry with their powers, but after overhearing him, future Barry uses Cisco's device to negate the villains' abilities, helping Barry capture them. Future Barry gives Barry information about a Speed Force trap and tells him to find a physicist named Tracy Brand, who developed the trap four years after Iris's death. In the present, Killer Frost meets with Savitar, who offers her the chance to eliminate Caitlin forever. She is reluctant to trust him, but changes her mind when Savitar's armor opens up, and he steps out, revealing his identity to her.
66	20	"I Know Who You Are"	Hanelle Culpepper	Bronwen Clark & Joshua V. Gilbert	May 2, 2017 (2017-05-02)	T27.13120	2.69
Barry, Cisco and H.R. visit Tracy to seek help in making a trap for Savitar; they are interrupted by Killer Frost, who attempts to kill Tracy but is defeated before she escapes. Tracy goes to S.T.A.R Labs with Team Flash and is shown her future. Killer Frost later decides to kidnap Joe's girlfriend, Cecile, and demand Tracy in exchange. Killer Frost's plan fails, leading to a battle between her and Cisco. Defeated, she is whisked away by Savitar, but not before Cisco draws some of her blood in order to potentially make a cure for her powers. Later, Tracy, inspired by the events, plans to build a trap for Savitar, while Barry has a revelation regarding Savitar's identity and runs outside the city to confront him. Meanwhile, Joe admits his love to Cecile and tells her about Barry and Wally's alter egos. H.R. develops feelings for Tracy. Savitar confirms Barry's new assumption and reveals himself to be a future Barry Allen.
67	21	"Cause and Effect"	David McWhirter	Judalina Neira & Lauren Certo	May 9, 2017 (2017-05-09)	TBA	N/A
Savitar explains that he is a time remnant of The Flash, created while trying to stop Savitar. After being shunned by Team Flash for not being the "real Barry", Savitar became depressed and went back in time to retrieve the Philosopher's Stone and and created himself. Cisco attempts to stop Savitar from remembering any of their strategies by stopping Barry from creating new memories, but due to a slight miscalculation, Barry ends up losing his memory. Savitar also loses all of his memories, resulting in Wally's powers disappearing since Savitar never created him. A pyromaniac on trial gets released because Barry cannot testify correctly due to his memory loss. Killer Frost helps Cisco and Julian develop a way for Barry to regain his powers, so that Savitar would as well. As the pyromaniac starts a fire, Iris helps Barry regain his memories in time to stop the fire with assistance from Wally. Tracy and H.R. bond over coffee and later kiss. Tracy then shows the team the completed Speed Force trap and reveals it will require 3.8 terrajoules of energy to work.
68	22	"Infantino Street"	Michael Allowitz	Story by : Andrew Kreisberg Teleplay by : Grainne Godfree	May 16, 2017 (2017-05-16)	TBA	N/A
69	23	"Finish Line"	David McWhirter	Aaron Helbing & Todd Helbing	May 23, 2017 (2017-05-23)	TBA	N/A

Ratings

Season 1 (2014–15)

Viewership and ratings per episode of List of The Flash episodes

No.	Title	Air date	Rating/share (18–49)	Viewers (millions)	DVR (18–49)	DVR viewers (millions)	Total (18–49)	Total viewers (millions)
1	"Pilot"	October 7, 2014	1.9/6	4.83	0.7	2.00	2.6	6.83
2	"Fastest Man Alive"	October 14, 2014	1.7/5	4.27	—	—	—	—
3	"Things You Can't Outrun"	October 21, 2014	1.5/4	3.59	—	—	—	—
4	"Going Rogue"	October 28, 2014	1.4/4	3.53	0.9	—	2.3	—
5	"Plastique"	November 11, 2014	1.4/4	3.46	1.0	—	2.4	—
6	"The Flash Is Born"	November 18, 2014	1.4/4	3.73	0.9	—	2.3	—
7	"Power Outage"	November 25, 2014	1.4/4	3.47	0.9	2.41	2.3	5.88
8	"Flash vs. Arrow"	December 2, 2014	1.6/5	4.34	1.0	2.31	2.6	6.65
9	"The Man in the Yellow Suit"	December 9, 2014	1.5/5	4.66	0.9	2.06	2.4	6.72
10	"Revenge of the Rogues"	January 20, 2015	1.4/5	3.87	1.0	2.41	2.4	6.27
11	"The Sound and the Fury"	January 27, 2015	1.3/4	4.08	1.0	2.20	2.3	6.28
12	"Crazy for You"	February 3, 2015	1.3/4	3.60	0.9	—	2.2	—
13	"The Nuclear Man"	February 10, 2015	1.5/5	3.66	—	—	—	—
14	"Fallout"	February 17, 2015	1.5/4	4.01	0.9	—	2.4	—
15	"Out of Time"	March 17, 2015	1.3/5	3.69	1.0	2.34	2.3	6.09
16	"Rogue Time"	March 24, 2015	1.2/4	3.33	1.0	2.37	2.2	5.69
17	"Tricksters"	March 31, 2015	1.3/4	3.67	1.0	2.43	2.3	6.10
18	"All Star Team Up"	April 14, 2015	1.4/5	3.67	0.9	2.05	2.3	5.72
19	"Who Is Harrison Wells?"	April 21, 2015	1.3/4	3.75	0.9	—	2.2	—
20	"The Trap"	April 28, 2015	1.5/5	3.93	0.9	—	2.4	—
21	"Grodd Lives"	May 5, 2015	1.5/5	3.62	0.9	2.27	2.4	5.97
22	"Rogue Air"	May 12, 2015	1.5/5	3.65	0.9	—	2.4	—
23	"Fast Enough"	May 19, 2015	1.5/5	3.87	1.0	2.38	2.5	6.25

Season 2 (2015–16)

Viewership and ratings per episode of List of The Flash episodes

No.	Title	Air date	Rating/share (18–49)	Viewers (millions)	DVR (18–49)	DVR viewers (millions)	Total (18–49)	Total viewers (millions)
1	"The Man Who Saved Central City"	October 6, 2015	1.4/5	3.58	1.0	2.35	2.4	5.93
2	"Flash of Two Worlds"	October 13, 2015	1.4/4	3.49	0.8	2.06	2.2	5.52
3	"Family of Rogues"	October 20, 2015	1.4/5	3.47	0.9	2.05	2.3	5.60
4	"The Fury of Firestorm"	October 27, 2015	1.4/4	3.43	0.9	2.04	2.3	5.46
5	"The Darkness and the Light"	November 3, 2015	1.5/5	3.87	0.8	1.68	2.3	5.55
6	"Enter Zoom"	November 10, 2015	1.5/5	3.63	0.9	2.05	2.4	5.68
7	"Gorilla Warfare"	November 17, 2015	1.4/4	3.46	0.8	1.92	2.2	5.38
8	"Legends of Today"	December 1, 2015	1.4/5	3.94	0.9	2.12	2.3	6.07
9	"Running to Stand Still"	December 8, 2015	1.3/4	3.55	0.9	2.01	2.2	5.56
10	"Potential Energy"	January 19, 2016	1.3/4	3.41	1.0	2.06	2.3	5.48
11	"The Reverse-Flash Returns"	January 26, 2016	1.4/5	3.71	1.0	2.02	2.4	5.73
12	"Fast Lane"	February 2, 2016	1.4/5	3.66	0.8	1.86	2.2	5.53
13	"Welcome to Earth-2"	February 9, 2016	1.6/5	3.96	0.9	2.02	2.5	5.98
14	"Escape from Earth-2"	February 16, 2016	1.5/5	3.90	0.8	1.77	2.3	5.67
15	"King Shark"	February 23, 2016	1.4/5	3.80	0.9	1.96	2.3	5.77
16	"Trajectory"	March 22, 2016	1.1/4	3.00	0.9	1.96	2.0	4.96
17	"Flash Back"	March 29, 2016	1.3/5	3.39	0.9	1.92	2.2	5.31
18	"Versus Zoom"	April 19, 2016	1.2/4	3.03	0.8	2.03	2.0	5.07
19	"Back to Normal"	April 26, 2016	1.3/5	3.39	0.8	1.86	2.1	5.26
20	"Rupture"	May 3, 2016	1.3/5	3.34	0.8	1.92	2.1	5.25
21	"The Runaway Dinosaur"	May 10, 2016	1.3/5	3.52	0.8	1.82	2.1	5.34
22	"Invincible"	May 17, 2016	1.3/5	3.37	0.9	2.08	2.2	5.45
23	"The Race of His Life"	May 24, 2016	1.3/5	3.35	0.6	1.49	1.9	4.85

Season 3 (2016–17)

Viewership and ratings per episode of List of The Flash episodes

No.	Title	Air date	Rating/share (18–49)	Viewers (millions)	DVR (18–49)	DVR viewers (millions)	Total (18–49)	Total viewers (millions)
1	"Flashpoint"	October 4, 2016	1.3/5	3.17	0.8	1.89	2.1	5.06
2	"Paradox"	October 11, 2016	1.1/4	2.80	0.7	1.92	1.8	4.72
3	"Magenta"	October 18, 2016	1.0/4	2.67	0.9	2.00	1.9	4.67
4	"The New Rogues"	October 25, 2016	1.0/3	2.80	0.9	1.91	1.9	4.71
5	"Monster"	November 1, 2016	1.0/3	2.77	0.9	2.01	1.9	4.78
6	"Shade"	November 15, 2016	1.2/4	3.01	0.9	2.06	2.1	5.07
7	"Killer Frost"	November 22, 2016	1.1/4	2.95	0.8	1.99	1.9	4.93
8	"Invasion!"	November 29, 2016	1.5/5	4.15	0.9	2.17	2.4	6.31
9	"The Present"	December 6, 2016	1.2/4	3.14	0.8	1.80	2.0	4.94
10	"Borrowing Problems From the Future"	January 24, 2017	1.0/3	2.72	0.8	1.92	1.8	4.64
11	"Dead or Alive"	January 31, 2017	1.1/4	3.06	0.7	1.64	1.8	4.71
12	"Untouchable"	February 7, 2017	1.1/4	2.91	0.7	1.68	1.8	4.59
13	"Attack on Gorilla City"	February 21, 2017	1.0/4	2.78	0.9	1.96	1.9	4.75
14	"Attack on Central City"	February 28, 2017	1.1/4	2.87	TBD	TBD	TBD	TBD
15	"The Wrath of Savitar"	March 7, 2017	0.9/3	2.52	0.7	1.71	1.6	4.23
16	"Into the Speed Force"	March 14, 2017	0.9/3	2.39	0.7	1.70	1.6	4.10
17	"Duet"	March 21, 2017	1.0/4	2.71	0.8	1.88	1.8	4.59
18	"Abra Kadabra"	March 28, 2017	0.9/3	2.39	0.7	1.67	1.6	4.06
19	"The Once and Future Flash"	April 25, 2017	1.0/4	2.67	TBD	TBD	TBD	TBD
20	"I Know Who You Are"	May 2, 2017	1.0/4	2.69	TBD	TBD	TBD	TBD

Home media

Season	DVD release dates			Blu-ray release dates
	Region 1	Region 2	Region 4	Region A	Region B
1	September 22, 2015	September 21, 2015	September 23, 2015	September 22, 2015	September 21, 2015
2	September 6, 2016	September 12, 2016	September 7, 2016	September 6, 2016	September 12, 2016