The movie is based on the comic book series by Mark Millar and John Romita Jr. The story follows Dave Lizewski (Aaron Johnson), an ordinary teenager who decides to become a superhero, taking on the alias "Kick-Ass." He teams up with Mindy McCready (Claudia Gerini), a wannabe superheroine, and together they face off against the villainous Frank D'Amico (Mark Strong) and his henchmen.