An ordinary comic-book fanboy teen who lives in Staten Island, New York decides to become a real-life superhero named Kick-Ass, but as he gets to work fighting crime, he realizes he can't save the world on his own.
Following Kick-Ass' heroics, other citizens are inspired to become masked crusaders. But Red Mist leads his own group of evil supervillains to get revenge, kill Kick-Ass and destroy everything he stands for.