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

While tracking mutagen, the Turtles bring a mutated squirrel back to the lair. When it starts multiplying, the Turtles must hunt the squirrel mutants and prevent them from escaping into the city.

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.

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.

Michelangelo plays with some mutagen, contracting a dangerous infection that mutates out of control.

April tries to resume her normal life; April realizes that she may have put her friend in jeopardy when Karai starts hunting her again.

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

After encountering mutants and ninjas, Casey Jones decides to take on "pure evil" alone. When he meets Raphael, the two hot-headed fighters must put their dislike for each other aside and work together against a common foe.

April feels left out and insists on joining the Turtles on a mission to TCRI; A secret about April's past is revealed...

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

After Donnie upgrades Metalhead's artificial intelligence, he must decide if he can trust a sentient Metalhead.

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

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.

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 play a Fantasy LARP game to get their minds off things, they separate the difference between fantasy and reality.

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

Raphael is worried about Casey's ability to handle big mutant threats especially when they meet Slash again and discover he has a partner of his own, the Newtralizer.

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

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.

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

Raphael accidentally damages a machine that forces him to swap minds with a Kraang. Now he must find a way to convince his brothers and Splinter that it's really him, before the Kraang controlling his body destroys his brothers or worse, reveals their location to the rest of the Kraang.

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.

Donnie becomes increasingly jealous of April and Casey's relationship; April is kidnapped by an evil spirit who intends to drain her powers.

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

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.

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.

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

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.

When he gets upset, Mikey flees and befriends a mutant frog in the woods, only to learn the frog and his family have nefarious plans.

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

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.

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.

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

When Karai is brainwashed, she begins hunting the Turtles.

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 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.

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.

Raphael meets a confused alien dinosaur named Zog, the 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.

The Turtles and their enemy crash-land on an ice moon and they must put aside their differences in order to survive.

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

The Turtles must gain the trust of the Utrom Council in order to find the next piece of the black hole generator.

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

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

Donatello is feeling inferior to Fugitoid, but his intellect is put to the test when the Triceratons attack.

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

The team must overcome impossible odds in order to obtain the final Black Hole Generator piece that is located on the planet Magdomar.

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

Raphael must overcome his fear of insects to lead the team when they are forced to battle Stockman-Fly's new insect minions.

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

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

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

Donatello becomes concerned and decides to test April, only to discover that her psychic abilities are rapidly growing in power.

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.

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

Karai searches for the legendary Kuro Kabuto, claiming to be the rightful heiress of the Foot Clan, when she suddenly encounters an old rival.

Donnie's grudge with Don Vizioso threatens the Turtle's newest mission.

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.

: The Turtles are transported to an alternate dimension, where they befriend the rabbit samurai and master swordsman: Miyamoto Usagi.

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

Usagi and the turtles must help Kintaro fulfill his destiny as they reach the end of their journey.

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.

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

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

Savanti is soon to recruit Frankenstein's Monster and unleash all of his monstrous recruits on the 21st Century.

When the Turtles and Renet return to a present-day New York City infested by an undead army of monsters, they realize they may have made the situation even worse.

When 80s Shredder and Krang appear in the 2012 dimension, they employ Bebop and Rocksteady and find their plans are succeeding better than ever. Meanwhile, the Turtles try to adjust to life without serious bad guys.

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.

The Turtles, their 1987 counterparts, April and the Mighty Mutanimals must work together to stop 80s' Shredder and Krang from destroying the world. Meanwhile, Bebop and Rocksteady are faced with a difficult and life-changing decision.