Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April / Wizardess), Josh Peck (Casey Jones), Nolan North (Graah / Announcer / Slug Person), Brian Bloom (Crognard), Scott Menville (Spooch)
Written By: Brandon Auman
Directed By: Sebastian Montes
Ep: 54
A Foot Too Big
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Josh Peck (Casey Jones), Diedrich Bader (Bigfoot / Announcer), Jesse Ventura (The Finger)
Written By: Doug Langdale
Directed By: Michael Chang
Ep: 55
Buried Secrets
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Josh Peck (Casey Jones), Renae Jacobs (Mrs. O'Neil / Mom-Thing)
Written By: Mark Henry
Directed By: Alan Wan
Ep: 56
The Croaking
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello / Tongue Frog), Mae Whitman (April / Wizardess), Josh Peck (Casey Jones / Frog #1), Jon Heder (Napoleon Bonafrog), Kevin Michael Richardson (Genghis / Frog #2), Maurice LaMarche (Attila / Rasputin), Brian Bloom (Crognard)
Written By: Kevin Burke & Chris "Doc" Wyatt
Directed By: Michael Chang
Ep: 57
In Dreams
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Josh Peck (Casey Jones), Robert Englund (Dire Beaver / Dread Beaver), John Kassir (Dark Beaver / Dave Beaver), Bill Moseley (Bernie)
Written By: Doug Langdale
Directed By: Sebastian Montes
Ep: 58
Race With the Demon
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello / Speed Demon Donatello), Mae Whitman (April), Josh Peck (Casey Jones), Steve Blum (Speed Demon / Human Driver / TV Announcer), Maggie Wheeler (Small Town Newscaster), Brian Bloom (Crognard / Muurg)
Written By: Gavin Hignight
Directed By: Alan Wan
Ep: 59
Eyes of the Chimera
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Josh Peck (Casey Jones)
Written By: Greg Weisman
Directed By: Michael Chang
Ep: 60
Vision Quest
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Hoon Lee (Splinter), Kevin Michael Richardson (Shredder), Josh Peck (Casey Jones), Eric Bauza (Tiger Claw), Clancy Brown (Rahzar), Christian Lanz (Fishface)
Written By: Todd Casey
Directed By: Sebastian Montes
Ep: 61
Return to New York
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Hoon Lee (Splinter), Kevin Michael Richardson (Shredder / Shredder Mutants), Josh Peck (Casey Jones), Nolan North (Kraang), Eric Bauza (Tiger Claw), Phil LaMarr (Stockman-Fly), Brian Bloom (Crognard), Scott Menville (Spooch), Jim Meskimen (Carlos Chang O'Brien / Megalord)
Written By: Brandon Auman
Directed By: Alan Wan
Ep: 62
Serpent Hunt
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Hoon Lee (Splinter), Kevin Michael Richardson (Shredder), Josh Peck (Casey Jones), Kelly Hu (Karai), J.B. Smoove (Zeck / Bebop), Fred Tatasciore (Steranko / Rocksteady), Christian Lanz (Fishface), Clancy Brown (Rahzar)
Written By: Randolph Heard
Directed By: Michael Chang
Ep: 63
The Pig and the Rhino
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April / Wizardess), Kevin Michael Richardson (Shredder / Scientist), Josh Peck (Casey Jones), Kelly Hu (Karai), Fred Tatasciore (Rocksteady / Ogre #1 / Soldier #1), J.B. Smoove (Bebop / Ogre #2), Brian Bloom (Crognard)
Written By: Brandon Auman
Directed By: Alan Wan
Ep: 64/65
Battle For New York
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Hoon Lee (Splinter), Josh Peck (Casey Jones), Gilbert Gottfried (Kraang Sub-Prime), Nolan North (Kraang / Man), A.J. Buckley (Pigeon Pete), Corey Feldman (Slash), Robert Forster (Kurtzman), Tom Kenny (Doc Rockwell), Peter Lurie (Leatherhead), Cassandra Peterson (Ms. Campbell), Kari Wahlgren (Woman)
Written By: Brandon Auman & Mark Henry
Directed By: Michael Chang & Sebastian Montes
Ep: 66
Casey Jones vs the Underworld
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (Wizardess), Hoon Lee (Splinter), Kevin Michael Richardson (Shredder), Josh Peck (Casey Jones), Phil LaMarr (Stockman-Fly / Driver), Eric Bauza (Tiger Claw / Hun), Brian Bloom (Crognard / Vizioso), Clancy Brown (Rahzar), Andrew Kishino (Fong / Sid), Christian Lanz (Fishface)
Written By: Andrew Robinson
Directed By: Sebastian Montes
Ep: 67
The Noxious Avenger
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Hoon Lee (Splinter), J.B. Smoove (Bebop), Fred Tatasciore (Rocksteady / Pedestrian / TV Announcer), Andrew Kishino (Fong / Sid), Grant Moninger (Muckman / Joe Eyeball / Garson), Kari Wahlgren (Joan Grody / Woman / Teen Girl)
Written By: Todd Casey
Directed By: Alan Wan
Ep: 68
Clash of the Mutanimals
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (Wizardess), Hoon Lee (Splinter), Kevin Michael Richardson (Shredder), Corey Feldman (Slash), Eric Bauza (Tiger Claw / Fulci Twin #1 / Fulci Twin #2), Brian Bloom (Crognard), A.J. Buckley (Pigeon Pete), Tom Kenny (Doc Rockwell / Malfidor), Phil LaMarr (Stockman-Fly), Peter Lurie (Leatherhead), Scott Menville (Spooch)
Written By: Henry Gilroy
Directed By: Michael Chang
Ep: 69
Meet Mondo Gecko
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April / Wizardess), Josh Peck (Casey Jones), Eric Bauza (Tiger Claw / Hun), Brian Bloom (Crognard / Police Radio), Clancy Brown (Rahzar / Homeless Guy), Andrew Kishino (Fong / Sid), Phil LaMarr (Stockman-Fly), Christian Lanz (Fishface), Scott Menville (Spooch), Robbie Rist (Mondo Gecko / Jason)
Written By: Kevin Burke & Chris "Doc" Wyatt
Directed By: Sebastian Montes
Ep: 70
The Deadly Venom
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Hoon Lee (Splinter), Kevin Michael Richardson (Shredder), Josh Peck (Casey Jones), Kelly Hu (Karai), Phil LaMarr (Stockman-Fly), Keith Silverstein (Kirby), Fred Tatasciore (Rocksteady)
Written By: Eugene Son
Directed By: Alan Wan
Ep: 71
Turtles in Time
Cast: Seth Green (Leonardo / Sir George), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello / Sir Paul), Ashley Johnson (Renet), Graham McTavish (Savanti Romero), Jim Piddock (Lord Simultaneous / Sir John)
Written By: Randolph Heard
Directed By: Michael Chang
Ep: 72
Tale of the Yokai
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Hoon Lee (Splinter / Hamoto Yoshi / Master Yuuta), Kevin Michael Richardson (Shredder / Oroku Saki), Ashley Johnson (Renet), Minae Noji (Tang Shen), Yuri Lowenthal (Ninja #1 / Ninja #2)
Written By: Brandon Auman
Directed By: Sebastian Montes
Ep: 73
Attack of the Mega Shredder!
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April / Wizardess), Hoon Lee (Splinter), Kevin Michael Richardson (Shredder / Mega Shredder), Josh Peck (Casey Jones), Eric Bauza (Tiger Claw / Homeless Guy), J.B. Smoove (Bebop), Fred Tatasciore (Rocksteady), Brian Bloom (Crognard), Scott Menville (Spooch), Kari Wahlgren (Joan Grody)
Written By: Gavin Hignight
Directed By: Alan Wan
Ep: 74
The Creeping Doom
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Hoon Lee (Splinter)
Written By: Peter Di Cicco
Directed By: Michael Chang
Ep: 75
The Fourfold Trap
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Hoon Lee (Splinter), Kelly Hu (Karai), J.B. Smoove (Bebop), Fred Tatasciore (Rocksteady), Eric Bauza (Tiger Claw), Clancy Brown (Rahzar), Christian Lanz (Fishface), Sab Shimono (Murakami)
Written By: Mark Henry
Directed By: Sebastian Montes
Ep: 76
Dinosaur Seen in Sewers!
Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (Wizardess), Nolan North (Kraang / Captain), Lance Henriksen (Zog), Corey Feldman (Slash), Tom Kenny (Doc Rockwell), Brian Bloom (Crognard / Commander), Scott Menville (Spooch)
Written By: Todd Casey
Directed By: Michael Chang
Ep: 77/78
Annihilation: Earth!
Cast: Seth Green (Leonardo / Triceraton #1), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello / Triceraton Pilot), Mae Whitman (April), Hoon Lee (Splinter), Kevin Michael Richardson (Shredder / Triceraton #2 / Triceraton #4), Josh Peck (Casey Jones), Nolan North (Kraang / Bishop / Triceraton #3), David Tennant (Fugitoid), Michael Dorn (Captain Mozar / Triceraton #1 / Triceraton #2 / Triceraton #3), Rachel Butera (Kraang Prime), Gilbert Gottfried (Kraang Subprime), Lance Henriksen (Zog), Eric Bauza (Tiger Claw / Triceraton), J.B. Smoove (Bebop), Corey Feldman (Slash), Tom Kenny (Doc Rockwell / Triceraton), Peter Lurie (Leatherhead / Triceraton), Grant Moninger (Muckman), Robbie Rist (Mondo Gecko), Fred Tatasciore (Rocksteady)