Teenage Mutant Ninja Turtles, Annihilation: Earth! Part 1

When a new mutant captures Casey, Raph, Mikey, Donnie, April, and Leo must overcome their disabilities 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 have to deal with a city filled with Kraangdroids as well as Zeck and Steranko, who hunt Karai for their own means.

Donnie finishes a new batch of retro-mutagen in hopes of saving Karai, and the Turtles are hunted by Shredder's new henchmen, Bebop and Rocksteady.

Part 1. 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.

Part 2. 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 alone but soon discovers he is over his head.

A new and unfamiliar mutant, Muckman, gains notoriety as New York City's `Monster Hero'.

With his mind-control serum completed, Shredder kidnaps and tests his Brain Worms on the Mighty Mutanimals.

Michelangelo and Casey become friends with Mondo Gecko, a radical, skateboarding, reptilian teenager.

Baxter Stockman inserts a mind control worm into Karai, whose brain is now conditioned to obey Shredder's orders without arguing. Shredder sends Karai to destroy Splinter, the turtles and their human allies.

When the Turtles are whisked through time by apprentice Time Master Renet, they all must work together to defeat the evil Time Master, Savanti Romero.

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

Leonardo sneaks into Shredder's lair alone and faces the biggest mutant threat.

Mikey causes a mishap with his clumsiness that causes significant damage. Donatello's intelligence is badly damaged, and old, unwanted acquaintances return to life. The turtles must now clean up the chaos again.

With the help of Baxter Stockman's mascots, Karai manages to attract the Turtles one by one. She wants to push Splinter to face him in a duel. His Machiavellian plan does not end there.

When Raphael makes a new friend in Zog, an alien Triceraton, he may have bitten off more than he can chew.

In part 1 of the season finale, the turtles hear the Kraang's return and soon realise an even bigger threat is coming to Earth.

In part 2 of the season finale, the turtles hear the Kraang's return and soon realise an even more significant threat is coming to Earth.