With high school graduation looming, Dave (aka Kick-Ass) decides to start the world's first superhero team with Mindy (aka Hit Girl). Unfortunately, when Mindy is busted for sneaking out as Hit Girl and is forced to retire, leaving her to navigate the world of high-school mean girls on her own. With no one left to turn to, Dave joins forces with Justice Forever, run by a born-again ex-mobster named Colonel Stars and Stripes. Just as they start to make a real difference on the streets, the world's first super villain, The Mother F%&*^r, assembles his own evil league and puts a plan in motion to make Kick-Ass and Hit Girl pay for what they did to his father. But there's only one problem with his scheme: If you mess with one member of Justice Forever, you mess with them all.