When the Turtles discover Bigfoot in the woods, Donnie befriends it and insists they protect it from a hunter.

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 Casey and Donatello bond while building Casey's new hot rod, the bond is challenged by a hot-rodding mutant.

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

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

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

When Casey, Raph, Mikey and Donnie are captured by a new mutant, April and Leo must overcome disabilities in order to save them.

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

A shark-like bounty hunter is hired by Lord Dregg to destroy the turtles, who choose to hide out in an abandoned space station.

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

The Turtles meet their first fan when a teenager decides to dress up and fight crime as "The Pulverizer.

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

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

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

Leonardo decides to sneak into Shredder's lair alone, and winds up facing the biggest mutant threat yet.

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

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

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

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

After an accident, Donnie finds himself slowly losing his intelligence.

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

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.