Teenage Mutant Ninja Turtles (2003 TV series, season 4)

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Teenage Mutant Ninja Turtles
Season 4
Country of originUnited States
No. of episodes26
Original network4Kids TV
Original releaseSeptember 10, 2005 (2005-09-10) –
April 15, 2006 (2006-04-15)
Season chronology
← Previous
Season 3
Next →
Season 5
List of episodes

The fourth season of Teenage Mutant Ninja Turtles originally aired between September 10, 2005 and April 15, 2006, beginning with the "Cousin Sid" episode. Fourteen random episodes from this season were released on DVD on September 12, 2006.[1] Much of this season focused on Leonardo, the group's leader, who became bitter, reserved and isolated following the final episode of the previous season in which he, his brothers and their master were almost killed. He went so far as to lash out at Splinter, causing him serious injury. This season is known among of fans as the darkest season of the series.[citation needed]


In the wake of their final battle with the Shredder, the Turtles retreat to the Jones family farmhouse to rest and recuperate, still heavily wounded and scarred. Leonardo in particular carries strong emotional scars from the battle, blaming himself for his family having to nearly sacrifice their lives to stop the Shredder. After the Turtles return to New York, they find that Hun has defected from the Foot Clan, instead returning to the Purple Dragons and transforming them from a street gang to a sophisticated crime organization. A successful raid on an Earth Protection Force train ends up being the final straw for the President of the United States, who threatens to cut the organization's funding for their repeated recent failures. Desperate to keep his organization afloat, Bishop engineers a staged alien invasion with man-made "aliens", which successfully convinces the President of his organization's value to protect the Earth. Unknown to Bishop, however, the residue from the destroyed alien clones leaks into New York City's sewers, and after coming into contact with local fauna, mutates them, triggering a massive mutant outbreak. During this outbreak, Baxter Stockman finally clones a new human body for himself, but it along with his sanity deteriorates, and he eventually drowns in the Hudson River while attacking April O'Neil. Nevertheless, Bishop brings him back from the dead in another cyborg body, deeming him too useful to lose.

In the meantime, Leo's emotional scars drive him to become progressively more hostile and surly to the point of wounding Splinter in an uncontrollable rage during a training session. Splinter sends Leo on a pilgrimage to the Ancient One, Hamato Yoshi's own master and father figure. The Ancient One is able to heal Leo's deep self-doubt and psychological scars, and takes the turtle under his wing. Back in New York, Karai takes up the Shredder's mantle, and rebuilds the Foot Clan to become a much more powerful organization, and with the help of the Foot Mystics, find the Turtles' lair and destroy it. Raphael, Michelangelo, Donatello, Splinter, and Klunk fake their deaths as they go into hiding. The Ancient One, having foreseen the attack, sends Leo back to New York, where he reunites his family and finds them a new home before defeating Karai, vowing that any further conflict between their clans will result in her death.

The Turtles struggle to fight Bishop's mutant outbreak, but things take a turn for the worse when Donnie is infected with the chemical agent responsible for the outbreak, mutating him once again. Leatherhead reports that Bishop's chemical agent is reacting violently with the Utrom mutagen already in his body, and will kill him in a matter of days. The group heads to Area 51 to ask for Bishop's aid in returning their brother to normal. Bishop agrees, but charges the Turtles with retrieving the Heart of Tengu, a relic possessed by Karai that an unknown entity has promised will grant him centuries of advancement in technology. The Turtles fulfill the agreement, and thanks to Leatherhead and Stockman's joint effort, cure Don and return him to normal. Meanwhile, Bishop inadvertently destroys the Heart of Tengu, having been fooled into doing so by the entity, who is revealed to be the Water Foot Mystic. The Heart of Tengu was an artifact that enabled the leaders of the Foot Clan to keep the Foot Mystics under their control. Now free, the Foot Mystics resolve to revive the "one, true Shredder".

In the season finale, the Turtles find themselves abducted by the mysterious Ninja Tribunal, along with four other warriors from across the globe. The 8 warriors are informed they are being drafted to combat a great evil that is poised to return, and they are taken to the Tribunal's monastery in Japan after passing their first test of character.


  • Michael Sinterniklaas as Leo: the leader of the Turtles who becomes very bitter after the Shredder's defeat. (26 episodes)
  • Wayne Grayson as Mike: the Turtles' youngest member and a source of comic relief. (25 episodes)
  • Sam Riegel as Don: the Turtles' genius engineer who is identified as the member who holds the team together. He suffers from a second mutation caused by the mutant outbreak, which is the cause for the final events of the season and, indirectly, for the events of the next season. (25 episodes (appears only in his non-speaking second mutation form in episode 24))
  • Frank Frankson as Raph: Leo's second-in-command who often argues with him. (25 episodes)


  • Darren Dunstan as Splinter: the Turtles' sensei and adopted father, who comes to realize his destiny as a guardian of the Utroms. (17 episodes)
  • Veronica Taylor as April: an ally of the Turtles who enters a relationship with Casey. (14 episodes)
  • Marc Thompson as Casey: an ally of the Turtles who enters a relationship with April. (12 episodes)
  • Karen Neill as Karai: the Shredder's adopted daughter and second-in-command, whose allegiance and devoted service come into question, as Leonardo tries to convince her to change sides. After the defeat of Ch'rell the last season finale, Karai vows to avenge him taking the mantle of the Shredder and serving as one of the two main antagonists of season 4.


  • Scott Williams as Stockman: a brilliant scientist who allies himself with Bishop to get revenge on the Turtles. (8 episodes)
  • David Zen Mansley as Bishop: a black ops agent in charge of the Earth Protection Force, an organization devoted to defending Earth from alien invasion. He plays a central role in the season serving as one of the two main antagonists, after the Shredder's defeat.
  • Greg Carey as Hun: a hulking gangster who is a former member of the Foot and the leader of the Purple Dragons, who tries to increase their reputation after the Shredder's defeat.
  • Sam Riegel as Dr. Chaplin: a young scientist who threatens not only Stockman's place in the Foot hierarchy, but his life as well.
  • Jason Griffith as Miyamoto Usagi: an ally of the Turtles who Leonardo encounters during an impromptu visit to his dimension.
  • F.B. Owens as Leatherhead: a mutant alligator who is a loyal ally of the Turtles.
  • David Chen as The Ancient One: an old ninjutsu master who taught Hamato Yoshi and helps Leonardo overcome his fears.
  • Scottie Ray as Ch'rell/The Shredder: the main antagonist of the series and leader of the Foot Clan. He was defeated and imprisoned by the Utrom Council on an ice asteroid for eternity. He only appears in the season in flashbacks or as an illusion. (3 episodes (has no lines in episode 19))


Teenage Mutant Ninja Turtles was produced by Mirage Studios, 4 Kids Entertainment, 4Kids Productions, and Dong Woo Animation and distributed by 4 Kids Entertainment and was aired on Fox's Saturday morning kids' block in the US.[2] The producers were Gary Richardson, Frederick U. Fierst, and Joellyn Marlow for the American team. Tae Ho Han was the producer for the Korean team.[2]


The fourth season was also critically acclaimed because of its darker and depressing stories. It had 2.25 million views as of May 2006 and has a rank of 88%.


No. in
TitleDirected byWritten byOriginal air dateProd.
791"Cousin Sid"Roy BurdineChristopher YostSeptember 10, 2005 (2005-09-10)S04E01
With their bodies bruised and their spirits wounded, the gang returns to the countryside to heal. Unfortunately, their recuperation is interrupted when Casey's cousin, Sid, shows up demanding money, which he needs to repay a debt to the Purple Dragons.
802"The People's Choice"Roy BurdineBaz HawkinsSeptember 17, 2005 (2005-09-17)S04E02
The Turtles go on a camping trip in the forest and explore an abandoned sawmill. Their sojourn is interrupted by an extraterrestrial mech that crashes into the nearby lake. The Turtles meet an alien, Jhanna, who is nominated to fight the corrupt Moriah in fair combat. When Moriah arrives on Earth, bringing with her an unfair advantage, the Turtles rush to Jhanna's aid. Meanwhile at the farm, Casey struggles to express his true feelings for April.
813"Sons of the Silent Age"Roy BurdineSteve MurphyOctober 1, 2005 (2005-10-01)S04E03
Still recovering in the countryside, the Turtles, April and Casey take a raft down the Connecticut River. April confronts Leonardo about his newfound ire and brooding attitude. As Leo expresses his resentment and shame from his last encounter with the Shredder, they are interrupted by a fish-like humanoid creature covered in radiation burns from a nearby nuclear power plant which possesses April's body and tells her of her past.
824"Dragon's Brew"Roy BurdineMichael RyanOctober 8, 2005 (2005-10-08)S04E04
Hun returns to the Purple Dragons and heads a campaign hijacking weapons shipments. Leonardo's newfound fury leads him to recruit Casey to put a stop to these thefts, however, when the two confront the Purple Dragons after a train hijacking, they encounter a foe that is a danger to all of them. A monster known as, T-9581.
835"I, Monster"Roy BurdineBrandon SawyerOctober 15, 2005 (2005-10-15)S04E05
The Turtles and Casey take their training to an abandoned brickworks and practice stealth in a game of hide and seek. Their training is soon interrupted by an enigmatic figure bandaged from head to toe. The man, who seems to have a special relationship with rats, attacks the team viciously and captures Michelangelo. Leonardo rambunctiously retaliates, to the chagrin of his brothers and Casey. Unbeknownst to them, the Turtles have played a large role in this stranger's dark past.
846"Grudge Match"Roy BurdineChristopher YostOctober 22, 2005 (2005-10-22)S04E06
Michelangelo is challenged by his former Battle Nexus rival, Kluh, who feels that an interference during their final match gave Mikey an unfair opportunity to win. Given the fluke-like nature of his victory, Mikey turns to Leonardo for help in training him to deal with an opponent twice his size. Despite his claims of unfairness, Kluh's father places a spell on the Battle Nexus to ensure that the rematch is a fight to the death.
857"A Wing and a Prayer"Roy BurdineBaz HawkinsSeptember 24, 2005 (2005-09-24)S04E07
During a night-time training exercise on the rooftops of New York City, the Turtles are interrupted by two warring Avians, a race whose appearance resembles angels. The Turtles come to the aid of Raptarr, who is trying to stop the exiled Mephos from starting a civil war in the Avian city and conquering the Earth.
868"Bad Day"Roy BurdineBrandon SawyerNovember 5, 2005 (2005-11-05)S04E08
During a meditation session, Master Splinter's sudden collapse is the first of a nightmarish chain of events, which force the Turtles to face death, destruction, and tragedy. Matters become worse as they come face-to-face with their most contentious foes, who, forming an alliance, seek to break the Turtles' spirits.
879"Aliens Among Us"Roy BurdineChristopher YostNovember 12, 2005 (2005-11-12)S04E09
When the president threatens to cut the funding of the Earth Protection Force, Agent Bishop engineers an alien invasion to attack the president during a press conference before a meeting at the United Nations.
8810"Dragons Rising"Roy BurdineMichael RyanNovember 19, 2005 (2005-11-19)S04E10
As Hun expands the Purple Dragons' power via illicit arms trades, the Turtles and Casey Jones seek to stop him yet again. Leonardo continues to unduly press his brothers while Casey seeks revenge on Hun for causing a tragic event during his childhood.
8911"Still Nobody"Roy BurdineBaz HawkinsNovember 26, 2005 (2005-11-26)S04E11
Nobody returns and reaches out to the Turtles and asks their help in stopping his foe, Ruffington, and the Purple Dragons from selling weapons to a violent street gang, the Turks.
9012"All Hallows Thieves"Roy BurdineGavin HignightOctober 29, 2005 (2005-10-29)S04E12
The Turtles are preparing to celebrate Halloween—one of the few times in the year where they can be seen in public. When costumed thieves steal a statue from April's antique shop, the Turtles put aside their jack-o'-lanterns and pursue them. This theft is part of a bigger plan by a sorcerer, the King of Thieves, who plans to use the statue to unleash a legion of minions on the city. When the Turtles come to disrupt his plans, the sorcerer summons the Thievery God, bringing the statue to life; it then sets out to destroy the Turtles.
9113"Samurai Tourist"Roy BurdineChristopher YostDecember 3, 2005 (2005-12-03)S04E13
Master Splinter invites Miyamoto Usagi—and the irresponsible, sloppy Murakami Gennosuke—from their dimension to Earth in the hopes that Usagi can speak to Leonardo about his wayward attitude. When Gen wanders off to explore downtown Manhattan, the Turtles, Usagi, and Casey set out to find him. Their search becomes complicated when an assassin, sent after Leonardo by Lord Hebi, follows Gen and Usagi to Earth.
9214"The Ancient One"Roy BurdineSteve MurphyDecember 10, 2005 (2005-12-10)S04E14
When Leonardo's anger causes him to injure Splinter, he seeks redemption by travelling to Japan. There, he begins a quest to find the Ancient One, who once trained Splinter's sensei, Hamato Yoshi.
9315"Scion of the Shredder"Roy BurdineEugene SonJanuary 28, 2006 (2006-01-28)S04E15
With Leonardo gone, Splinter, Raphael, Donatello, and Michelangelo witness the return of the Shredder. They are plunged into the fight of their lives as they ward off volleys of Foot Ninja and Foot Mechs that lay waste to their lair.
9416"Prodigal Son"Roy BurdineGavin HignightFebruary 4, 2006 (2006-02-04)S04E16
Leonardo returns home to find the lair in ruins and his family missing. His search for answers and his family eventually lead him to the realization that Karai is no longer an ally.
9517"Outbreak"Roy BurdineChristopher YostFebruary 11, 2006 (2006-02-11)S04E17
Following the invasion engineered by Agent Bishop, genetic material from the replicated aliens combines with inhabitants of the sewers and surrounding waterways, causing a mutant outbreak. Fearing the spread of outbreak, Bishop sends Baxter Stockman to contain the threat. Meanwhile, the Turtles search for items to furnish their new lair, but now must face the threat of attacking mutants.
9618"Trouble with Augie"Roy BurdineEugene SonFebruary 18, 2006 (2006-02-18)S04E18
April discovers a distress signal from her Uncle Augie, who became trapped in another dimension years ago. She appeals to Donatello for help and they use April's puzzle cube to travel across the multiverse. They find Augie, along with his new lizard-like friends, the Brotherhood, who claim they wish to help the inhabitants of Earth. Unfortunately, they soon discover the Brotherhood's true aspirations are not so benevolent.
9719"Insane in the Membrane"Roy BurdineMatthew DrdekFebruary 25, 2006 (2006-02-25)S04E19
The mutant outbreak continues to spread throughout the sewers and subway tunnels while the Turtles try to contain the threat. Back at Area 51, Baxter Stockman prepares a new body for cerebral transfer despite warnings from Agent Bishop. When Stockman's body begins to show signs of rejection, he becomes delirious, which leads to a rampage against the person he believes to have caused all his problems, April O'Neil. In the end, seeing April as his mother due to his delusions, Stockman sacrifices himself by being drowned in the East River while handing her to the Turtles and Casey.
9820"Return of Savanti, Part 1"Roy BurdineChristopher YostMarch 11, 2006 (2006-03-11)S04E20
Savanti Romero plots his revenge against the Turtles and Renet after they had him banished to the Cretaceous period. Using his magic to manipulate time, Romero lures the Turtles and Renet into a trap to obtain the time sceptre.
9921"Return of Savanti, Part 2"Roy BurdineChristopher YostMarch 18, 2006 (2006-03-18)S04E21
Having travelled to the past, the Turtles and Renet battle with Savanti Romero and his telepathically controlled dinosaurs as Savanti attempts to change the historic timeline by preventing the dinosaur extinction event.
10022"Tale of Master Yoshi"Roy BurdineSteve MurphyMarch 4, 2006 (2006-03-04)S04E22
When the power goes out in their lair, the Turtles and Splinter gather around the candlelight as Leonardo tells a story he learned from the Ancient One about Splinter's sensei, Hamato Yoshi.
10123"Adventures in Turtle Sitting"Roy BurdineRoland GonzalezMarch 25, 2006 (2006-03-25)S04E23
The Turtles continue to deal with the seemingly unstoppable mutant outbreak, but they leave Donatello under care of April and Casey when he becomes very ill. However, Donnie's illness is not just a cold; he is in the final stages of a secondary mutation that will transform him into a savage beast, to which the other turtles and Leatherhead must work together to capture. Meanwhile, Bishop recovers Stockman's brain from the bottom of the East River and resurrects Stockman giving him the half monster, half cyborg body.
10224"Good Genes, Part 1"Roy BurdineChristopher YostApril 1, 2006 (2006-04-01)S04E24
When it is apparent that Don's secondary mutation is causing his body to degenerate, the Turtles and Leatherhead agree they must go directly to Agent Bishop's headquarters to demand a cure. This scenario proves to be fortuitous as Bishop offers to help the Turtles if they retrieve an ancient piece of technology from the Foot.
10325"Good Genes, Part 2"Roy BurdineChristopher YostApril 8, 2006 (2006-04-08)S04E25
The Turtles agree to Bishop's offer in exchange for the cure to Donatello's secondary mutation. They are charged with infiltrating the Foot's headquarters and retrieving the Heart of Tengu. However, Bishop does not have a cure for Donnie and the retrieval of the Heart of Tengu turns out to be the groundwork for a plan that even Bishop doesn't understand.
10426"Ninja Tribunal"Roy BurdineMichael RyanApril 15, 2006 (2006-04-15)S04E26
Still recovering from Donnie's secondary mutation, he feels cooped up inside the new lair. To help him out, the other Turtles decide to take Don topside to get some much needed air. The Turtles are then ambushed and captured by masked wooden warriors. The Turtles arrive before the Ninja Tribunal, 4 beings with a great resemblance to the Shredder. Along with four other warriors, the Tribunal entreats the group for aid against a greater evil.


  1. ^ Season Four Episode list with detailed synopses at the Official Ninja Turtles website
  2. ^ a b "TMNT credits on Dongwoo Animation". Dongwoo Animation Co. Archived from the original on December 19, 2008. Retrieved 2008-05-01.

External links[edit]