- Ep: 105
- Scroll of the Demodragon
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Hoon Lee (Splinter), Josh Peck (Casey Jones), Eric Bauza (Tiger Claw / Crimson Leader), Brian Bloom (Captain Ryan), Scott Menville (Crankshaw Jr. / Nefrini #1), Mark Hamill (Kavaxas)
- Written By: Randolph Heard
- Directed By: Sebastian Montes
- Ep: 106
- The Forgotten Swordsman
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Josh Peck (Casey Jones), Kelly Hu (Karai), Eric Bauza (Tiger Claw), Michael Hagiwara (Tatsu), Gwendoline Yeo (Shini), Christian Lanz (Fishface / Foot Soldier #1), Clancy Brown (Rahzar), Mark Hamill (Kavaxas)
- Written By: Peter Di Cicco
- Directed By: Alan Wan
- Ep: 107
- Heart of Evil
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo / Pizza Delivery Boy), Rob Paulsen (Donatello), Mae Whitman (April), Eric Bauza (Tiger Claw / Vic / Vinnie / The Hammer / Masks), Kelly Hu (Karai), Brian Bloom (Don Vizioso), JB Smoove (Bebop), Fred Tatasciore (Rocksteady / Suit Man / Masks), Mark Hamill (Kavaxas)
- Written By: Gavin Hignight
- Directed By: Rie Koga
- Ep: 108
- End Times
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Kevin Michael Richardson (Undead Shredder), Kelly Hu (Karai), Josh Peck (Casey Jones), Eric Bauza (Tiger Claw / The Hammer), JB Smoove (Bebop), Fred Tatasciore (Rocksteady), Christian Lanz (Fishface), Peter Lurie (Leatherhead / Z), James Hong (Ho Chan), Brian Bloom (Captain Ryan), Scott Menville (Crankshaw Jr.), Mark Hamill (Kavaxas)
- Written By: Brandon Auman
- Directed By: Sebastian Montes
- Ep: 109/110
- When Worlds Collide
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Kelly Hu (Karai), Brian Bloom (Captain Ryan), Keith David (Sal Commander), Scott Menville (Crankshaw Jr.), Kate Micucci (Rook), Nolan North (Bishop / Pawn / Utromdroids / General R'Kavaka), Cassandra Peterson (Queen), Peter Stormare (Lord Dregg), Danny Trejo (Newtralizer), Zelda Williams (Mona Lisa)
- Written By: Todd Casey & Elliott Casey & Eugene Son
- Directed By: Sebastian Montes & Alan Wan
- Ep: 111
- Yojimbo
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Yuki Matsuzaki (Usagi), Keone Young (Jei / Samurai #1), Evan Kishiyama (Kintaro), Brittany Ishibashi (Akemi), Cary-Hiroyuki Tagawa (Sumo Kuma), Tohoru Masamune (Samurai #2 / Samurai #3 / Samurai #4)
- Written By: Stan Sakai
- Directed By: Rie Koga
- Ep: 112
- Osoroshi no Tabi
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Yuki Matsuzaki (Usagi), Keone Young (Jei), Evan Kishiyama (Kintaro), Brittany Ishibashi (Akemi / Joroguma)
- Written By: Brandon Auman
- Directed By: Sebastian Montes
- Ep: 113
- Kagayake! Kintaro
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Yuki Matsuzaki (Usagi), Keone Young (Jei), Evan Kishiyama (Kintaro), Cary-Hiroyuki Tagawa (Sumo Kuma)
- Written By: Henry Gilroy
- Directed By: Alan Wan
- Ep: 114
- Lone Rat and Cubs
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Hoon Lee (Splinter), Nolan North (Krangdroid / Norman)
- Written By: Kevin Eastman
- Directed By: Alan Wan
- Ep: 115/116/117
- Raphael: Mutant Apocalypse
- Cast: Sean Astin (Raphael), Seth Green (Leonardo / Maximus Kong), Rob Paulsen (Donbot), Greg Cipes (Michelangelo), Jessica DiCicco (Mira), Nyambi Nyambi (Verminator Rex / Eyewear Ravager / Painted Ravager / Jock Ravager), Keith Morris (Reptilicus), Kevin Michael Richardson (Honey Badger Ravager #2 / Grill Ravager / Leather Ravager / Aviator Ravager / Scale Tail Scribe / Scale Tail), Dee Bradley Baker (Chompy / Ravager Spy / Honey Badger Ravager #3 / Top Hat Ravager / Scale Tail #1 / Scale Tail #2 / Mini-Zoid / Synthezoids), Brian Bloom (Captain Ryan / Scale Tail #3), Scott Menville (Crankshaw Jr. / Cyberg Leader / Scale Tail), Dave B. Mitchell (Dr. Mindstrong)
- Written By: Brandon Auman & Peter Di Cicco & Gavin Hignight
- Directed By: Rie Koga & Sebastian Montes & Alan Wan
- Ep: 118
- The Curse of Savanti Romero
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Josh Peck (Casey Jones), Brian Bloom (Captain Ryan), Ashley Johnson (Renet), Scott Menville (Crankshaw Jr. / Mr. Gigabyte / Man #2), Grant Moninger (Pharoah Mummy / The Monster)
- Written By: Peter Di Cicco
- Directed By: Rie Koga
- Ep: 119
- The Crypt of Dracula
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Ashley Johnson (Renet), Graham McTavish (Savanti Romero), Dana Delorenzo (Esmeralda), Dimitri Diatchenko (Vulko / Werewolf / Lone Knight), Grant Moninger (Pharoah Mummy), Chris Sarandon (Dracula)
- Written By: John Shirley
- Directed By: Sebastian Montes
- Ep: 120
- The Frankenstein Experiment
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Kevin Michael Richardson (Shredder / Super Shredder / Undead Shredder), Ashley Johnson (Renet), Graham McTavish (Savanti Romero), Grant Moninger (Dr. Frankenstein / Igor / The Monster / Pharoah Mummy), Chris Sarandon (Dracula)
- Written By: Brandon Auman
- Directed By: Alan Wan
- Ep: 121
- Monsters Among Us!
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Josh Peck (Casey Jones), Ashley Johnson (Renet), Graham McTavish (Savanti Romero), Grant Moninger (The Monster / Pharoah Mummy), Chris Sarandon (Dracula), Dimitri Diatchenko (Vulko / Lead Knight)
- Written By: Kevin Burke & Chris "Doc" Wyatt
- Directed By: Rie Koga
- Ep: 122/123/124
- Wanted: Bebop & Rocksteady
- Cast: Seth Green (Leonardo), Sean Astin (Raphael), Greg Cipes (Michelangelo), Rob Paulsen (Donatello), Mae Whitman (April), Kevin Michael Richardson ('87 Shredder), Brian Bloom (Captain Ryan / Evil Captain Ryan), JB Smoove (Bebop), Cam Clarke ('87 Leonardo / '87 Rocksteady), Townsend Coleman ('87 Michelangelo / Clerk), Pat Fraley ('87 Krang), Barry Gordon ('87 Donatello / '87 Bebop), Corey Feldman (Slash), Kelly Hu (Karai), Scott Menville (Crankshaw Jr. / Evil Crankshaw Jr. / Punk), Josh Peck (Casey Jones), Robbie Rist (Mondo Gecko), Fred Tatasciore (Rocksteady), Gwendoline Yeo (Shini)
- Written By: Peter Di Cicco & Mark Henry & Jed MacKay
- Directed By: Rie Koga & Sebastian Montes & Alan Wan
| Sean Astin ........................ Raphael "Raph" |
| Seth Green ........................ Leonardo "Leo" |
| Greg Cipes .................. Michelangelo "Mikey" |
| Rob Paulsen ................... Donatello "Donnie" |
| Hoon Lee .......... Master Splinter / Hamato Yoshi |
| Mae Whitman ......................... April O'Neil |
