Warning: The following contains spoilers for Teenage Mutant Ninja Turtles: Mutant Mayhem.The Teenage Mutant Ninja Turtles got their start in a gritty comic book series in the 1980s, but since then, their story has been adapted for several animated movies and series, video games, and live-action movies. Their story has even been adapted for other comic books. The most recent Ninja Turtles adaptation is Teenage Mutant Ninja Turtles: Mutant Mayhem, which sees the turtles take on villains who are just like them.