The series follows Dave Lizewski your average comic book loving teenager in a real world take of his foray into vigilanteism where superheroes only exist in comic books. Bored of his mundane life, Dave wonders why no one has ever tried to become a costumed hero before, and so, he makes a costume, begins a regimen, and joins the fight against crime as Kick-Ass. His first encounter doesn't go as planed. But soon enough Kick-Ass finds out he isn't alone in the fight against injustice as he meets Big Daddy, a pseudo Punisher, and his ten year old daughter, Hit-Girl, whose sword mastery and agility rival that of a ninja. After Kick-Ass gains a bit of attention off a youtube clip, Dave's class mate crush, Katie Deauxma, develops a crush on his costumed hero persona, Kick-Ass. While others find inspiration in his heroics and begin to follow suit, creating hero clubs and the like, but one of the inspired, The Red Mist, becomes an overnight sensation, gaining adoration from the media, local authorities, and the blogosphere, out shining Kick-Ass. But Kick-Ass won't have any of it. And so, a friendly rivalry is born as Kick-Ass, The Red Mist, Big Daddy and Hit-Girl team-up to take on New York City's biggest mob boss Johnny G.