After the Turtles find Bigfoot in the woods, Donnie befriends it and insists they save it from a hunter.
The team discover a Kraang ship buried under April's house, they also uncover April's lost mother.
After he becomes upset, Mikey leaves and befriends a mutant frog he finds in the woods.
Creatures that feed off dreams trap the Turtles inside their own dreams as April and Casey must find a way to wake them up.
When Casey, Raph, Mikey and Donnie are captured by a new mutant, both April and Leo must overcome disabilities in order to save them.
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.
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.
Leo is suspicious when Slash emerges leading a team called the Mighty Mutanimals; the Turtles must brave the bizarre world of Dimension X to save the enslaved people of New York.
Casey Jones thinks he can take on the criminal underworld on his own, but soon discovers that he is in over his head.
The Turtles get whisked through time by apprentice Time Master Renet, and they must all work together to defeat the evil Time Master Savanti Romero.
When the Turtles are accidentally transported to the past, they happen to cross paths with a familiar ninja clan.
Leonardo decides to sneak into Shredder's lair alone, and winds up facing the biggest mutant threat yet.