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Teenage Mutant Ninja Turtles

Leatherhead is a recurring character in the TMNT franchise, typically portrayed as a mutated alligator with varying degrees of intelligence and aggression. He first appeared in Teenage Mutant Ninja Turtles Adventures #6 in October 1989.

In many iterations, Leatherhead is depicted as a Louisiana alligator who was mutated by Utrom technology. He often possesses a brilliant mind, twisted by the mutation, and a volatile temper. His backstory commonly involves being experimented on or displaced from his natural habitat, leading to resentment towards humans and, at times, the Turtles themselves.

Leatherhead's relationship with the Turtles is complex, ranging from uneasy alliance to outright antagonism, depending on the specific TMNT continuity. Despite his monstrous appearance and aggressive tendencies, he is often shown to possess a sense of honor and, in some versions, even befriends the Turtles.