What's Past Is Prologue (The Flash)

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"What's Past Is Prologue"
The Flash episode
Episode no.Season 5
Episode 8
Directed byTom Cavanagh
Written by
Production codeT27.13758
Original air dateDecember 4, 2018 (2018-12-04)
Guest appearance(s)
Episode chronology
← Previous
"O Come, All Ye Thankful"
Next →
"Elseworlds, Part 1"
The Flash (season 5)
List of The Flash episodes

"What's Past Is Prologue" is the eighth episode of the fifth season of the American television series The Flash, based on the DC Comics character Barry Allen / Flash, a crime scene investigator who gains super-human speed, which he uses to fight criminals, including others who have also gained superhuman abilities. It is set in the Arrowverse, sharing continuity with the other television series of the universe, and is a spin-off of Arrow. The episode was written by Todd Helbing and Lauren Certo, directed by Tom Cavanagh, and is the series' 100th episode.

Grant Gustin stars as Barry, and is joined by principal cast members Candice Patton, Danielle Panabaker, Carlos Valdes, Hartley Sawyer, Danielle Nicolet, Jessica Parker Kennedy, Chris Klein, Cavanagh, and Jesse L. Martin. The episode sees Barry and his daughter Nora travel back in time and take a trip down memory lane where they cross paths with several of the show's past speedsters in order to gather some key necessities to stop Cicada. Several recurring guest stars make appearances, including Michelle Harrison, John Wesley Shipp, Teddy Sears, and Tony Todd. Shipp also reprises his role as Barry Allen / Flash from the 1990 television series in a pre-credits scene that ties-in with the Arrowverse crossover "Elseworlds".

"What's Past Is Prologue" originally aired on The CW on December 4, 2018, and was watched by 1.78 million viewers according to Nielsen Media Research. The episode received a positive critical response.


Barry Allen and Nora West-Allen time travel to gather items to stop Cicada; a highly magnetic alloy from Savitar's armor, dark matter, and Harry Wells' Speed Force transmitter to transfer dark matter into the armor piece. They first travel to Barry's final battle against Savitar. After a Time Wraith appears, Barry distracts it so Nora can retrieve a piece of the armor. They next travel to when Hunter Zolomon / Zoom stole Barry's speed for the transmitter, which Barry obtains from Harry. Just as Barry and Nora are about to leave, Zolomon discovers them and gives chase before being stopped by the Time Wraith. However, this causes Barry and Nora to crash land and damage the transmitter.

Barry learns they ended up on the day that his 2016 self went back in order to get faster. Although he is reluctant, Nora convinces him to ask Eobard Thawne for help. Despite heavy resistance, Thawne fixes the transmitter after Barry convinces him by claiming he will never get home if he does not. Finally, they travel to the night of the particle accelerator explosion. In the Time Vault, Gideon reroutes part of the dark matter through the shard and transmitter, and Barry reveals to Nora that Thawne killed his mother. The accelerator explodes, recalibrating the transmitter and turning it into a power dampener. They then hide it inside a hospital's pillar before returning to the present day so they can confront Cicada there.

Meanwhile, Sherloque Wells continues to investigate Nora's intentions for being in 2018 by poring through her journal and translating the strange symbols inside. When he confronts Nora about them, she claims that she made them up in order to keep track of changes to the timeline. Sherloque returns the journal, but hides having translated a message from it stating, "The timeline is malleable."

Team Flash separate Cicada from his dagger and Cisco Ramon sends it to space. However, Cicada recalls it, due to his increasing power, and nearly kills Barry before Killer Frost emerges from Caitlin Snow and knocks Cicada back, forcing him to retreat. Later, Nora transmits her latest journal entries to a mysterious individual through Gideon, and travels to 2049 to confront Thawne at Iron Heights.

In a pre-credits scene, the Flash of Earth-90 fails to stop a mysterious individual[a] from using a powerful book to destroy his universe and is forced to run.


Development and writing[edit]

At the 2018 San Diego Comic-Con, it was announced that the eighth episode of The Flash's fifth season and the series' 100th episode would not be taking place during the annual Arrowverse crossover event like had been the case with the previous seasons' eighth episodes. The Arrowverse showrunners "flipflopped" the placement of the crossover in order to make the milestone 100th episode separate, with the ninth episode being part of the crossover instead. Cast member Tom Cavanagh was also revealed to be directing the episode.[2] Executive producer and showrunner Todd Helbing said the episode will act as a sort of midseason finale and be "a little bit different,"[3] with "a big twist to carry us over".[2]

Ahead of the premiere of the fifth season, Helbing explained that "[they] wanted to do something special" for the episode by "taking the audience on a trip to remind everybody of all the cool stuff we've done for five years now. We wanted to relive the coolest moments on our show, so we came up this concept and it both honors what we've done so far and also propels the show for the rest of the season."[4] Cast member Candice Patton also commented that the episode "kind of really revisits what makes our show special" and "there are a lot of special things happening in [the] episode".[5] At the end of October 2018, Tony Todd, who voiced Zoom in the second season, revealed the episode would feature "all the [past] speedster villains" returning "wanting a piece of Barry".[6][3]

In mid-November 2018, The CW announced that the episode was titled "What's Past is Prologue", written by Helbing and Lauren Certo, and released the synopsis revealing that Barry and Nora would be travelling back in time to "gather some key necessities" to stop Cicada.[7] The episode's title was taken from a line in William Shakespeare's play The Tempest.[8] Two weeks later, Jessica Parker Kennedy revealed that in the episode Nora gets to see a special moment between her mom and dad "that like really breaks her heart". Patton added, "She gets to see Barry and Iris as we've known to love them over the past four seasons," with Parker Kennedy concluding that "the episode really brings the three of them closer."[9] Grant Gustin said the episode "felt like Back to the Future style time travel, seeing ourselves see ourselves in these other moments through a new lens. It was really cool."[10]


Main cast members Grant Gustin, Candice Patton, Danielle Panabaker, Carlos Valdes, Hartley Sawyer, Danielle Nicolet, Jessica Parker Kennedy, Chris Klein, Tom Cavanagh, and Jesse L. Martin appear in the episode as Barry Allen / Flash, Iris West-Allen, Caitlin Snow / Killer Frost, Cisco Ramon / Vibe, Ralph Dibny / Elongated Man, Cecile Horton, Nora West-Allen / XS, Orlin Dwyer / Cicada, Sherloque Wells and Joe West, respectively. Cavanagh also plays Harry Wells of Earth-2 and Eobard Thawne / Reverse-Flash. Martin appears in the episode only in archived footage due to a back injury he sustained prior to the start of filming of the season.

LaMonica Garrett as Mar Novu / Monitor and John Wesley Shipp as Barry Allen / Flash from the 1990 television series appear in a post-credit scene.[1]


Filming of the episode began on September 26, 2018,[11] and concluded by early October.[12] Gustin thought it was great that they were able to have Cavanagh direct the episode, saying "[Cavanagh] took such good care; he understands the journey... we've found a lot of details that probably wouldn't have been found otherwise."[10]

Arrowverse tie-ins[edit]

In November 2018, it was revealed that the eighth episodes of The Flash, Arrow, and Supergirl would feature "puzzling events" that lead to the events of the annual Arrowverse crossover event, titled "Elseworlds".[13] A pre-credits scene teasing the events of crossover aired at the end of The Flash's "What's Past Is Prologue", Arrow's "Unmasked", and Supergirl's "Bunker Hill". The scene also confirmed Earth-90 as the earth for the Flash from the 1990 television series.[1] Marc Guggenheim, who acted as the showrunner for the crossover,[14] felt the tease was "cool because we’ve never... setup the crossover in the previous episodes before." The tease was meant to be one of two options for the "Elseworlds" cold opening. The writers could not choose which they wanted to use, with Guggenheim explaining someone decided to "take one cold open, move that and make that the post-credit tag, like the way The Flash typically does, at the end of all three shows, and then have the other cold open at the beginning of hour one." Supergirl co-showrunner Robert Rovner added that the tease was only supposed to air with The Flash's eight episode, before being added to the other two episodes to make things easier for viewers since they "are coming to [the crossover] from our separate shows and we wanted something that [connects them together]."[1]


"What's Past is Prologue" was first aired in the United States on The CW on December 4, 2018.[7] It became available for streaming on Netflix in Canada on December 6, 2018,[15] while it was first aired in the United Kingdom on Sky One on December 6, as well.[16]



In the United States, the episode received a 0.7/3 percent share among adults between the ages of 18 and 49, meaning that it was seen by 0.7 percent of all households, and 3 percent of all of those watching television at the time of the broadcast. It was watched by 1.78 million viewers.[17] The episode improved 17% in the 18–49 rating on the previous episode, "O Come, All Ye Thankful".[18]

Critical response[edit]

The review aggregator website Rotten Tomatoes reported a 93% approval rating for the episode, based on 14 reviews, with an average rating of 8.31/10. The website's critical consensus reads, "'What's Past is Prologue' takes viewers on a Flash-tastic journey back in time with a series of flashbacks that make for an eventful, charming, and commemorative 100th episode."[19]


  1. ^ Identified off-screen as Mar Novu / Monitor.[1]


  1. ^ a b c d Agard, Chancellor (December 2, 2018). "Supergirl post-credit scene teases the Monitor's plan in 'Elseworlds' crossover". Entertainment Weekly. Archived from the original on December 3, 2018. Retrieved December 2, 2018.
  2. ^ a b Damore, Meagan (July 21, 2018). "SDCC: The Flash Cast & Crew Talk Season 5 Details". Comic Book Resources. Archived from the original on November 30, 2018. Retrieved November 30, 2018.
  3. ^ a b Mitovich, Matt Webb (October 27, 2018). "The Flash's 100th Episode: [Spoiler] Returns, 'Wanting a Piece of Barry'". TVLine. Archived from the original on November 30, 2018. Retrieved November 30, 2018.
  4. ^ Bucksbaum, Sydney (October 6, 2018). "DC TV Watch: 'The Flash' Season 5 Takes on a New Structure". The Hollywood Reporter. Archived from the original on November 30, 2018. Retrieved November 30, 2018.
  5. ^ Mitovich, Matt Webb (October 17, 2018). "Matt's Inside Line: Scoop on Supergirl, Arrow, Grey's, Manifest, #OneChicago, Star, Legends, Supernatural and More". TVLine. Archived from the original on November 30, 2018. Retrieved November 30, 2018.
  6. ^ Dominguez, Noah (October 28, 2018). "Flash's Most Iconic Villains Will Return for Episode 100". Comic Book Resources. Archived from the original on November 30, 2018. Retrieved November 30, 2018.
  7. ^ a b Keene, Allison (November 16, 2018). "'The Flash': 100th Episode Synopsis Teases a Trip through the Past". Collider. Archived from the original on November 30, 2018. Retrieved November 30, 2018.
  8. ^ Plante, Corey (December 4, 2018). "'The Flash' Episode 100 Dives Into the Show's Best Use of Time Travel Yet". Inverse. Archived from the original on December 6, 2018. Retrieved December 6, 2018.
  9. ^ MacDonald, Lindsay (November 28, 2018). "The Flash's 100th Episode Will Reveal a Touching Westallen Moment". TV Guide. Archived from the original on November 30, 2018. Retrieved November 30, 2018.
  10. ^ a b Byrne, Craig (December 2, 2018). "Interview: Grant Gustin Talks Flash Episode 100". FlashTVNews. Archived from the original on December 3, 2018. Retrieved December 2, 2018.
  11. ^ Panabaker, Danielle [@dpanabaker] (September 26, 2018). "Today is the first day of production on our 100th episode of @CW_TheFlash. I almost can't believe it. Thanks to everyone who has supported us on this journey and helped make it possible to 100 episodes!" (Tweet). Archived from the original on September 26, 2018. Retrieved September 26, 2018 – via Twitter.
  12. ^ Brown, Tracy (October 9, 2018). "Get a first look at Ruby Rose as Batwoman". Los Angeles Times. Archived from the original on October 10, 2018. Retrieved October 9, 2018.
  13. ^ Holbrook, Damian (November 21, 2018). "Stephen Amell, Grant Gustin & Melissa Benoist Tease What to Expect in 'Elseworlds'". TV Insider. Archived from the original on November 21, 2018. Retrieved November 24, 2018.
  14. ^ Agard, Chancellor (October 15, 2018). "Arrow boss teases lighter crossover as Stephen Amell shares BTS photo of Superman". Entertainment Weekly. Archived from the original on October 18, 2018. Retrieved October 17, 2018.
  15. ^ "The Flash – Season 5 (2018)". What's New on Netflix Canada Today!. Archived from the original on December 1, 2018. Retrieved December 1, 2018.
  16. ^ "The Flash – Season 5 Episode 8". Sky One. Archived from the original on December 1, 2018. Retrieved November 30, 2018.
  17. ^ Welch, Alex (December 5, 2018). "'NCIS: New Orleans' adjusts up: Tuesday final ratings". TV by the Numbers. Archived from the original on December 6, 2018. Retrieved December 5, 2018.
  18. ^ Patten, Dominic (December 5, 2018). "'The Conners' Stumbles To Season Low, 'Flash' Speeds Up For 100th Episode". Deadline Hollywood. Archived from the original on December 6, 2018. Retrieved December 5, 2018.
  19. ^ "The Flash – Season 5, Episode 8". Rotten Tomatoes. Fandango. Archived from the original on December 9, 2018. Retrieved December 9, 2018.

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