While the Turtles are infiltrating an undersea Kraang base, the Foot Clan attempts to capture April.

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

The Turtles discover that the Kraang survived their previous showdown and have dropped mutagen canisters all over New York City.

Donatello experiments with mutagen in an attempt to find a cure for April's mutated father. But one of his expirements goes wrong and he is unleashed in the city.

The Turtles find themselves being hunted by a new threat -- another mutant turtle called Slash, who has a personal vendetta against the brothers.

A fungus mutant spreads through the sewers causing the Turtles to experience their worst fears. Leonardo must face his greatest fear.

When the Rat King returns, Splinter must overcome his fears in order to defeat his enemy.

The Turtles create a retro-mutagen to help April's father; Baxter Stockman threatens to mutate April.

Mikey struggles to convince the others that a new mutant is trying to attack and capture people using living pizzas.

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.

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

The team tries to deal with the possibility that Leo will not get better; a new mutant captures Raphael.

When the Turtles are trapped in their dreams by creatures, April and Casey must figure out how to wake them up.

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

Part 2

Casey Jones thinks he can take on the criminal underworld on his own, but soon discovers that he is in over his head.

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

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

After being kidnapped by the hypnotized Karai, the Turtles are placed in deadly traps that they must work together in in order to escape. Splinter, in his efforts to save the turtles, is forced to face Karai in order to free her from Shredder's control.

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.

Casey releases a wish-granting alien named Wyrm, who wants his freedom to do whatever he wants to the universe

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The Turtles journey through an ocean-like area of space.

When Raphael loses his fighting mojo, he must overcome his feelings to save his brothers from certain doom.

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Don Vizioso's gang tracks the Turtles with a slew of Anti-Mutant weapons.

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

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The Turtles believe they have defeated most of their old enemies, but they soon discover that a new evil is rising from the ashes.

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When Mona Lisa suddenly arrives on Earth, Raphael must get her and Bishop to work together to defeat an alien threat and save the Earth

The Newtralizer returns to New York City, more powerful than ever before, and joins forces with a dangerous and unexpected ally. With the help of Raphael's Salamandrian girlfriend, Mona Lisa, the Turtles fight back to defend their city.

Usagi leads the Turtles through a haunted forest, where they end up encountering mischievous and highly dangerous spirits.

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An older and weathered Raphael battles road gangs in a post-apocalyptic mutant wasteland.

An older, weathered Raphael battles road gangs in a post-apocalyptic mutant wasteland.

Renet transports the Turtles to 13th century Transylvania to stop Savanti Romero.

The Turtles must train their 80s counterparts into fighting like real ninja. The 80s Turtles begin to learn the difference between their world and the world of their modern counterparts.