Within the Woods
E1
The team tries to deal with the possibility that Leo will not get better; a new mutant captures Raphael.
A Foot Too Big
E2
When the Turtles discover Bigfoot in the woods, Donnie befriends it and insists they protect it from a hunter.
Buried Secrets
E3
When the guys discover a Kraang ship buried under April's house, they also uncover April's lost mother.
The Croaking
E4
When he gets upset, Mikey flees and befriends a mutant frog in the woods, only to learn the frog and his family have nefarious plans.
In Dreams
E5
When the Turtles are trapped in their dreams by creatures, April and Casey must figure out how to wake them up.
Race with the Demon!
E6
When Casey and Donatello bond while building Casey's new hot rod, the bond is challenged by a hot-rodding mutant.
Eyes of the Chimera
E7
When Casey, Raph, Mikey and Donnie are captured by a new mutant, April and Leo must overcome disabilities in order to save them.
Vision Quest
E8
Leo takes the Turtles to train in the woods in an advanced ninja ritual; the Turtles must overcome their weaknesses and face their enemies to become a true ninja.
Return to New York
E9
When the Turtles return to the city to search for Splinter, they discover that the city has been overrun with Kraang.
Serpent Hunt
E10
As the Turtles search for Karai, they are forced to deal with a city filled with Kraangdroids as well as Zeck and Steranko.
The Pig and the Rhino
E11
Donnie finishes a new batch of retro-mutagen in hopes of saving Karai; the Turtles are hunted by Shredder's new henchmen, Bebop and Rocksteady.
Battle for New York (1)
E12
The Turtles must brave the bizarre world of Dimension X to save the enslaved people of New York. Part 1
Battle for New York (2)
E13
Part 2
Casey Jones vs the Underworld
E14
Casey Jones thinks he can take on the criminal underworld on his own, but soon discovers that he is in over his head.
The Noxious Avenger
E15
A new and unfamiliar mutant known as Muckman begins to gain notoriety as New York City's "Monster Hero."
Clash of the Mutanimals
E16
The Shredder kidnaps and experiments on the Mighty Mutanimals.
Meet Mondo Gecko
E17
Michelangelo and Casey become friends with Mondo Gecko, a radical, skateboarding, reptilian teenager.
The Deadly Venom
E18
When Karai is brainwashed, she begins hunting the Turtles.
Turtles in Time
E19
When the Turtles are whisked through time by apprentice Time Master Renet, they all must work together to defeat the evil Time Master Savanti Romero.
Tale of the Yokai
E20
When the Turtles are accidentally transported to the past, they happen to cross paths with a familiar ninja clan.
Attack of the Mega Shredder!
E21
Leonardo decides to sneak into Shredder's lair alone, and winds up facing the biggest mutant threat yet.
The Creeping Doom
E22
After an accident, Donnie finds himself slowly losing his intelligence.
The Fourfold Trap
E23
After being kidnapped by the hypnotized Karai, the Turtles are placed in deadly traps that they must work together in in order to escape. Splinter, in his efforts to save the turtles, is forced to face Karai in order to free her from Shredder's control.
Dinosaur Seen in Sewers!
E24
Raphael meets a confused alien dinosaur named Zog, the Triceraton.
Annihilation: Earth! (1)
E25
When the turtles get word of the Kraang's return, they realize there is an even bigger threat coming to Earth.
Annihilation: Earth! (2)
E26
When the turtles get word of the Kraang's return, they realize there is an even bigger threat coming to Earth.