After being provoked from stopping the Kraang invasion and being outmatched by Shredder and Kraang Prime, April, Casey and the Turtles take refuge inside a cabin far from the city in the woods.

When the Turtles discover Bigfoot in the woods, Donnie befriends it and insists they protect it from a hunter.

The turtles find an old alien spacecraft that is connected to April's past.

Mikey runs away and befriends a mutant frog. Only to learn the frog and his family have nefarious plans.

The turtles get trapped in their dreams by Dream Beavers. They can't escape except with the help of a man.

When Casey and Donatello work together to build a hot rod, a mutant challenges them.

When Casey, Raph, Mikey, and Donnie are captured by a new mutant, 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.

The turtles return to New York, facing the Kraang and Kraang Prime for a rematch to see who New York really belongs to.

As the Turtles search for Karai, they must deal with a city filled with Kraang and Shredder.

Donnie finishes a new batch of Retro-Mutagen in hope 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.

A new mutant called Muckman starts to gain notoriety as NYC's "Monster Hero".

The Shredder kidnaps and experiments on the Mighty Mutanimals.

Michelangelo meets Mondo Gecko, a skateboarding mutant, and tries to save him from being condemned to a life of crime.

When Karai is brainwashed, she begins hunting the Turtles.

The Turtles travel back in time and must help a young sorceress stop a dreadful warrior.

The Turtles end up in Japan's past and must save a young Hamato Yoshi.

Leonardo decides to sneak into Shredder's lair alone, and winds up facing the biggest mutant threat yet.

After an accident, Donnie finds himself slowly losing his intelligence.

The Turtles are baited by an unknown enemy into deadly traps.

Raph makes a new friend named Zog, an alien dinosaur. But Zog is hiding a dark secret.

When the turtles get word of the Kraang's return, they realize there is an even bigger threat coming to Earth.

When the turtles get word of the Kraang's return, they realize there is an even bigger threat coming to Earth.