The Teenage Mutant Ninja Turtles are shocked to discover a mutated crocodile living in their old lair, but the friendship that might have developed among them is cut short by the appearance of an old enemy.
The Teenage Mutant Ninja Turtles meet Leatherhead, a crocodile whose experiences mirror their own, and are just starting to make friends when their old enemy Baxter Stockman appears on the scene.
