Kick-Ass tells the story of average teenager Dave Lizewski (Aaron Johnson), who decides to take his obsession with comic books as inspiration to become a real-life superhero. As any good superhero would, he chooses a new name, Kick-Ass, assembles a suit and mask to wear, and gets to work fighting crime. There's only one problem: Kick-Ass has absolutely no superpowers.
His life is forever changed as he inspires a subculture of copycats, meets up with a pair of crazed vigilantes: an 11-year-old-sword-wielding dynamo, Hit Girl (Chloe Moretz) and her father, Big Daddy (Nicolas Cage) and forges a friendship with another fledgling superhero, Red Mist (Christopher Mintz-Plasse). But thanks to the scheming of local mob boss Frank D'Amico (Mark Strong), that new alliance will be put to the test.