January 2010, an international trailer of the film was slammed by family groups for its display of violence and use of the line "OK you cunts, let's see what you can do now" delivered by actress Chloe Moretz, who was 12 at the time of filming.
Australian Family Association spokesman John Morrissey claimed "the language offensive and the values inappropriate - without the saving grace of the bloodless victory of traditional superheroes".
In response to the controversy, Ms. Moretz stated in an interview with MTV, "If I ever uttered one word that I said in 'Kick-Ass', I would be grounded for years! I'd be stuck in my room until I was 20! I would never in a million years say that. I'm an average, everyday girl."
"Kick-Ass" is based on the 8-issue "Kick-Ass" comic book mini-series created by Mark "Wanted" Millar and John Romita Jr. following a superhero fan who decides to become a costumed crime-fighting vigilante. Along the way, he meets up with other vigilantes including 'Red Mist' and father-daughter team 'Big Daddy' and 'Hit Girl'.
Visually, Vaughn wanted to make a bright and glossy film', "...so what happens in the film is shocking, not the style...", he said. "I just let the characters do the dark stuff and let the lighting be... I just thought it would be interesting to juxtapose the look and the action... "
Vaughn acquired film rights to "Kick-Ass" for his Marv Films, when the KA comic book debuted February 2008. He then financed the film independently after "every studio turned it down".
"Kick-Ass" is co-produced by Brad Pitt, Dede Gardner and Jeremy Kleiner for Plan B.
Premise of "Kick-Ass" follows 'Dave Lizewski', a New York City high school student, who takes an interest in comic books as his cue to become a vigilante hero, assembling a suit and mask, worn under his normal clothing.
His first attempt at fighting crime results in Dave being overpowered, then hit by a car. But determined to retain his secret identity, he hides his costume before paramedics arrive.Dave tells his father he was mugged, before undergoing four operations followed by intense physical rehabilitation. Weeks later, bruised but undaunted, Dave tosses his crutches, dons his costume and takes off again for 'patrol'.
After saving a man in need of assistance, an onlooker films the scene on a cellphone camera and uploads it to YouTube, turning Dave Lizewski into an instant media sensation called 'Kick-Ass'.
The $70 million comic book adaptation will be released by Lionsgate April 16, 2010.