1Within the Woods
The team tries to deal with the possibility that Leo will not get better; a new mutant captures Raphael.
2A Foot Too Big
When the Turtles discover Bigfoot in the woods, Donnie befriends it and insists they protect it from a hunter.
3Buried Secrets
When the guys discover a Kraang ship buried under April's house, they also uncover April's lost mother.
4The Croaking
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.
5In Dreams
When the Turtles are trapped in their dreams by creatures, April and Casey must figure out how to wake them up.
6Race with the Demon!
When Casey and Donatello bond while building Casey's new hot rod, the bond is challenged by a hot-rodding mutant.
7Eyes of the Chimera
When Casey, Raph, Mikey and Donnie are captured by a new mutant, April and Leo must overcome disabilities in order to save them.
8Vision Quest
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.
9Return to New York
When the Turtles return to the city to search for Splinter, they discover that the city has been overrun with Kraang.
10Serpent Hunt
As the Turtles search for Karai, they are forced to deal with a city filled with Kraangdroids as well as Zeck and Steranko.
11The Pig and the Rhino
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.
12Battle for New York (1)
The Turtles must brave the bizarre world of Dimension X to save the enslaved people of New York. Part 1
13Battle for New York (2)
Part 2
14Casey Jones vs the Underworld
Casey Jones thinks he can take on the criminal underworld on his own, but soon discovers that he is in over his head.
15The Noxious Avenger
A new and unfamiliar mutant known as Muckman begins to gain notoriety as New York City's "Monster Hero."
16Clash of the Mutanimals
The Shredder kidnaps and experiments on the Mighty Mutanimals.
17Meet Mondo Gecko
Michelangelo and Casey become friends with Mondo Gecko, a radical, skateboarding, reptilian teenager.
18The Deadly Venom
When Karai is brainwashed, she begins hunting the Turtles.
19Turtles in Time
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.
20Tale of the Yokai
When the Turtles are accidentally transported to the past, they happen to cross paths with a familiar ninja clan.
21Attack of the Mega Shredder!
Leonardo decides to sneak into Shredder's lair alone, and winds up facing the biggest mutant threat yet.
22The Creeping Doom
After an accident, Donnie finds himself slowly losing his intelligence.
23The Fourfold Trap
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.
24Dinosaur Seen in Sewers!
Raphael meets a confused alien dinosaur named Zog, the Triceraton.
25Annihilation: Earth! (1)
When the turtles get word of the Kraang's return, they realize there is an even bigger threat coming to Earth.
26Annihilation: Earth! (2)
When the turtles get word of the Kraang's return, they realize there is an even bigger threat coming to Earth.