Narrowly escaping from the Shredder and the Kraang, the turtles, April, and Casey take shelter at April's family farmhouse upstate to recover and figure out how to stop the Kraang. The turtles deal with not having Splinter around and the possibility of Leo not making a full recovery, and a mysterious creature stalks the group.

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

When the guys discover a Kraang ship buried under April's house, they also uncover April's lost mother.

After getting in trouble for trashing the house, Michelangelo gets upset and flees. After meeting the Napoleon Bonafrog, a member of the Punk Frogs, he unknowingly joins them in a plan to capture the humans and take over the city.

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 and Donatello bond while building Casey's new hot rod, the bond is challenged by a hot-rodding mutant.

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.

When the Turtles return to the city to search for Splinter, they discover that the city has been overrun with Kraang.

As the Turtles search for Karai, they are forced to deal with a city filled with Kraangdroids as well as Zeck and Steranko.

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.

While the Mighty Mutanimals lay siege to TCRI, 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 and unfamiliar mutant known as Muckman begins to gain notoriety as New York City's 'Monster Hero'.

The Shredder kidnaps and experiments on the Mighty Mutanimals.

A skateboarding reptilian becomes friends with Mikey and Casey.

Karai becomes brainwashed and goes after the turtles.

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.

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 Triceraton.

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.