A man believes he has put his mysterious past behind him and has dedicated himself to beginning a new, quiet life. But when he meets a young girl under the control of ultra-violent Russian gangsters, he can't stand idly by - he has to help her.
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.