Teenage Mutant Ninja Turtles (Playmates, 1988–present)

If you haven’t tripped over a Teenage Mutant Ninja Turtle action figure in the dead of night, are you even a fan? Since '88, these green dudes have been more than toys; they're a cultural typhoon in plastic. Fans obsess over variants like 'Undercover Donatello' with his breakable gadgets—because what’s fun without a little frustration, right? In the 'Greatest Action Figure Lines of All Time', they’re the ninjas in the room everyone can't stop talking about. Love them or hate them, but ignoring them? Good luck with that.