Geeky teen Dave Lizewski decides to become a superhero, even though he has no super powers, training in martial arts or any good sense. Donning a vintage wetsuit and heading out onto the streets 'Kick Ass' becomes an internet sensation. Soon his antics bring him to the attention of the city's criminals, eager to stamp out the vigilante, and it isn't long before he crosses paths with several other costumed crime-fighters.