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

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Teenage Mutant Ninja Turtles (2003 TV series, season 4)
Country of originUnited States
No. of episodes25
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 Teenage Mutant Ninja Turtles (2003 TV series) 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 more 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 dark season of the 2003 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, Leonardo'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 Leonardo on a pilgrimage to the Ancient One, Hamato Yoshi's own master and father figure. The Ancient One is able to heal Leonardo'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 their pet cat Klunk fake their deaths as they go into hiding. The Ancient One, having foreseen the attack, sends Leonardo 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 Donatello 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 Donatello 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 eight 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.


Main cast[edit]

  • Michael Sinterniklaas as Leonardo, the leader of the Turtles who becomes very disturbed after the Shredder's defeat. (26 episodes)
  • Frank Frankson as Raphael, Leonardo's second-in-command who often argues with him. (25 episodes)
  • Sam Riegel as Donatello, 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 its non-speaking second mutation form in episode 24))
  • Wayne Grayson as Michelangelo, the Turtles' youngest member and a source of comic relief. (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)
  • Scottie Ray as Ch'rell/Oroku Saki/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 as an illusion or in flashbacks (3 episodes (has no lines in episode 19))
  • Veronica Taylor as April O'Neil, an ally of the Turtles who enters a relationship with Casey Jones. (14 episodes)
  • Marc Thompson as Casey Jones, an ally of the Turtles who enters a relationship with April O'Neil. (12 episodes)
  • Scott Williams as Baxter Stockman, a brilliant scientist who allies himself with Bishop to get revenge on the Turtles. (8 episodes)

Recurring cast[edit]

  • David Zen Mansley as Agent John 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.
  • 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 Oroku Saki's defeat last season, Karai vows to avenge him taking the mantle of the Shredder and serving as one of the two main antagonists of season 4.
  • 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.


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]


No. in
No. in
Title Directed by Written By Original air date TV
791"Cousin Sid"Roy BurdineChristopher YostSeptember 10, 2005 (2005-09-10)S04E01
802"The People's Choice"Roy BurdineBaz HawkinsSeptember 17, 2005 (2005-09-17)S04E02
813"Sons of the Silent Age"Roy BurdineSteve MurphyOctober 1, 2005 (2005-10-01)S04E03
824"Dragon's Brew"Roy BurdineMichael RyanOctober 8, 2005 (2005-10-08)S04E04
835"I, Monster"Roy BurdineBrandon SawyerOctober 15, 2005 (2005-10-15)S04E05
846"Grudge Match"Roy BurdineChristopher YostOctober 22, 2005 (2005-10-22)S04E06
857"A Wing and a Prayer"Roy BurdineBaz HawkinsSeptember 24, 2005 (2005-09-24)S04E07
868"Bad Day"Roy BurdineBrandon SawyerNovember 5, 2005 (2005-11-05)S04E08
879"Aliens Among Us"Roy BurdineChristopher YostNovember 12, 2005 (2005-11-12)S04E09
8810"Dragons Rising"Roy BurdineMichael RyanNovember 19, 2005 (2005-11-19)S04E10
8911"Still Nobody"Roy BurdineBaz HawkinsNovember 26, 2005 (2005-11-26)S04E11
9012"All Hallows Thieves"Roy BurdineGavin HignightOctober 29, 2005 (2005-10-29)S04E12
9113"Samurai Tourist"Roy BurdineChristopher YostDecember 3, 2005 (2005-12-03)S04E13
9214"The Ancient One"Roy BurdineSteve MurphyDecember 10, 2005 (2005-12-10)S04E14
9315"Scion of the Shredder"Roy BurdineEugene SonFebruary 4, 2006 (2006-02-04)S04E15
9416"Prodigal Son"Roy BurdineGavin HignightFebruary 11, 2006 (2006-02-11)S04E16
9517"Outbreak"Roy BurdineChristopher YostFebruary 18, 2006 (2006-02-18)S04E17
9618"Trouble with Augie"Roy BurdineEugene SonFebruary 25, 2006 (2006-02-25)S04E18
9719"Insane in the Membrane"Roy BurdineMatthew DrdekOctober 14, 2006 (2006-10-14) (UK)
August 2, 2015 (2015-08-02) (US)[3]
9820"Return of Savanti, Part 1"Roy BurdineChristopher YostMarch 11, 2006 (2006-03-11)S04E20
9921"Return of Savanti, Part 2"Roy BurdineChristopher YostMarch 18, 2006 (2006-03-18)S04E21
10022"Tale of Master Yoshi"Roy BurdineSteve MurphyMarch 4, 2006 (2006-03-04)S04E22
10123"Adventures in Turtle Sitting"Roy BurdineRoland GonzalezMarch 25, 2006 (2006-03-25)S04E23
10224"Good Genes, Part 1"Roy BurdineChristopher YostApril 1, 2006 (2006-04-01)S04E24
10325"Good Genes, Part 2"Roy BurdineChristopher YostApril 8, 2006 (2006-04-08)S04E25
10426"Ninja Tribunal"Roy BurdineMichael RyanApril 15, 2006 (2006-04-15)S04E26


  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.
  3. ^ Nicktoons USA To Premiere "Teenage Mutant Ninja Turtles" (2003) Episode "Insane in the Membrane" On Sunday 2nd August 2015

External links[edit]