Leatherhead is a fictional character in the Teenage Mutant Ninja Turtles series. He was created in 1987 by Mirage Studios artist Ryan Brown, who also went on to create the Saturday morning cartoon series Wild West C.O.W.-Boys of Moo Mesa for the ABC television network. He is a mutated, anthropomorphic alligator (sometimes a crocodile) and appears in all TMNT versions except for the movies and live action series.