The Turtles must brave the bizarre world of Dimension X to save the enslaved people of New York. Part 1

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.

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

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

The Turtles face an army of robot foot soldiers; Karai captures Leonardo and forces him to do battle with ninjas that can adapt to his every move.

A new and unfamiliar mutant known as Muckman begins to gain notoriety as New York City's "Monster Hero."

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

The Turtles' plans to enjoy Halloween are put on hold when strange monsters threaten to transform New York City.

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

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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.

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

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.

After witnessing the Kraang in action, Karai realizes the seriousness of the alien threat and proposes an alliance with the Turtles....unless the Shredder finds out.

Michelangelo befriends Leatherhead, an unstable mutant alligator who possesses a strange piece of Kraang technology, but the other Turtles aren’t sure whether Leatherhead is a friend or a foe.

Snakeweed returns and begins abducting people. Tired of Raphael's constant criticism while trying to stop Snakeweed, Leonardo lets Raphael try his hand at leadership. While away from the group, Leonardo meets a female Foot Ninja named Karai, who tries to lure him to the dark side.

Donatello breaks into a secret Kraang detention center in order to rescue Kirby O'Neil, but ends up trapped inside with a deadly prisoner called the Newtralizer.

Leo fears his act of mercy has come back to haunt him when Xever holds a local noodle shop owner hostage.

The Turtles must defend their home in the sewers when Chris Bradford tries to destroy it with a dangerous chemical.

While breaking into the hostile environment of TCRI headquarters, the Turtles discover the true intent of the Kraang and resolve to stop the alien invasion once and for all.

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When Leonardo secretly allies himself with Karai, he gets himself into deeper danger than he could have realized.

For fifteen years, four mutant Turtles and their rodent sensei have lived a secret life beneath the sewers of New York. Coming to the surface for the first time, the Turtles soon find their day out interrupted as a young girl and her father become the targets of mysterious, and dangerous, men...

When April O'Neil is abducted, the Turtles search leads to the base of the robotic Kraang army, and Leonardo struggles to unify his rebellious brothers to victory.