Leo and Donnie disagree about their plan to stop the Kraang invasion; Donnie must step up as the leader of the bunch when Leo makes a mistake and is separated from the team.

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

Super Shredder has returned with even greater vengeance, forcing the Turtles to enlist the combined aid of Splinter, April, Casey, Karai, Shinigami and the Mighty Mutanimals to destroy him once and for all.

With the demise of their beloved father and Karai incapacitated, the Turtles, April, and Casey, infiltrate Super Shredder's new lair to put an end to Oroku Saki once and for all, no matter what it takes.

Leonardo considers asking Splinter for help while facing Shredder's new assassin; Donnie must put aside his rivalry with Casey in order to uncover a Kraang plot.

When the Turtles are accidentally transported to the past, they happen to cross paths with a familiar ninja clan.

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

With the world at stake, the only thing of importance is that the Turtles complete their mission. No matter what ...

Leonardo considers asking Splinter for help while facing Shredder's new assassin; Donnie must put aside his rivalry with Casey in order to uncover a Kraang plot.

For the first time, the Turtles encounter something they cannot defeat – the Super Shredder!

The Turtles are transported to another dimension where they meet their 1980s counterparts and work together to battle Krang.

When Splinter is first mutated, he must learn to survive the life of a mutant on the run while also protecting four baby mutant turtles.

The turtles engage in a difficult battle, as they make a desperate assault on TCRI to shut down the Kraang portal.

Leo stages a rescue for Karai against Splinter's wishes. While the mission is a success, Karai's knowledge of the truth makes her rush out to take her revenge on Shredder for killing her mother and lying to her for so long, leading to an unexpected turn of events.

Leo and Donnie disagree about their plan to stop the Kraang invasion; Donnie must step up as the leader of the bunch when Leo makes a mistake and is separated from the team.

As the team finally reaches Earth, the Fugitoid reveals a horrible secret about his past.

When Tiger Claw returns, he vows to hunt and destroy the turtles, as well as April and Casey. Meanwhile, Karai finds out the truth about her mother and real father, forcing her to make a life changing decision.

After April receives a warning from her imprisoned father, she and the Turtles embark on a mission to save him and stop The Kraang from detonating a mutagen bomb in the city.

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 Turtle team hunts for their Sensei, but soon realizes they are being hunted as well.

Leo tries to convince the team to rescue Karai; a master thief steals Shredder’s helmet.

When the Turtles go to the bizarre realm of Dimension X, Mikey is the only one who can figure the place out.

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

When Karai is brainwashed, she begins hunting the Turtles.

The Turtles must face off against a new enemy, The Rat King, who threatens not only to take control of the city, but of Splinter's mind as well.