Kick-Ass 2 has been around in comic form for some time now, and it's heading towards screens with momentum now that a director is in place in the shape of Jeff Wadlow. We caught up with Millar at Kapow! Comic Con to find out what we can expect from the movie sequel, as well as the final chapter of the comic series. Spoilers ahead!
So Jeff Wadlow has been appointed as director on Kick-Ass 2. Why was he chosen to helm the project?
"Matthew Vaughn chose the director about 18 months ago secretly because he knew he wasn't going to be doing Kick-Ass 2 since he had taken on the X-Men franchise. For a little while, a few weeks, it looked like he might do Kick-Ass 2, but they poured a bucket of money over him to do X-Men instead.
"Jeff Wadlow had been talking to Matthew about doing this move Bloodshot a couple of years back and Matthew was really impressed with his script. He'd done a couple of movies on a small budget, and Matthew was like 'trust me, this is the guy'.
"So the three of us have been talking seriously for about eight months, and Jeff turned in a final draft of the screenplay about eight weeks ago. It's in really nice shape to start shooting in eight or nine weeks' time."
Are the original cast on course to return for the sequel? We understand that there may be some scheduling concerns over Chloe Moretz.
"As far as we know everyone is scheduled to come back, unless somebody is hit by a bus or something. Chloe has a busy schedule but she has to stop sometime."
Is adapting the comic going to prove a challenge because of the changes that the original made to its source material?
"One of the only things that was really different in the first one was Big Daddy's origin. It seem a little more realistic for Dave not to get the girl in the comics after him lying and stuff, but that was only two panels at the end.
"I wasn't sure about the jetpack scene because everything else was so grounded in the film, but they said to me 'it needs to be bigger at the end'. I think they made it work. You were invested enough after 90 minutes that you didn't mind a jetpack at the end."
There are some very controversial scenes in the Kick-Ass 2 comic book. Will it have to be toned down for the screen?
"Every horrible scene in the book will be in the film. The c**t line in the first one, everybody said 'there's no way you're getting that in the movie', but it happened and it's the same thing with this. Everybody is saying 'you can't have a gang rape scene with supervillains' and 'you can't have the dog's head cut off', but every single one of those scenes will go in it."
How much material from the Hit-Girl spinoff comic is going to make it into Kick-Ass 2?
"Hit-Girl will be the first 30 minutes of the movie and then the next 70 minutes is Kick-Ass 2. So Hit-Girl is structured as the first act."
We heard that there are plans to include an animated sequence in the second film provided by John Romita Jr. Is this true?
"As far as I know, there's not one, but if there is one, John is the one that will do it. Maybe they'll put one in, but in the script at the moment there isn't one."
The Red Mist character undergoes a radical change in the sequel. Do you think Christopher Mintz-Plasse is up to the job of playing The Motherf**ker?
"Totally! The thing I love about it is there was a movie I saw years ago called Once Upon a Time in the West, and Henry Fonda, who is the nicest all-American actor of that era shoots a child at the start of that film, and you're like 'oh my God', because it's Henry Fonda. If you saw somebody who is a bad guy, like a Lee Van Clief type, doing that it's not nearly as shocking.
What does the future hold for Kick-Ass in comic books?
"The third book of Kick-Ass is the last book, there won't be any more after that. Even though it's the biggest book I've ever done, I've really always thought there's an end in sight, so I plan on finishing it in a year's time."
So what's coming up in Kick-Ass 3?
"People who've read the comic will know that the second one ends on a cliffhanger. Hit-Girl's been arrested and she's in prison, Dave has lost his dad and he's kind of destitute. The third one will be set two years later, and it's about where their lives are now, picking it up from there.
"Hit-Girl has killed 80-something people by this point, so they're never going to let her out. She's like a tiny Myra Hindley.
"It's basically illegal to wear a costume at this point, so that's quite interesting. I used to love Marvel Comics where the cops were chasing superheroes, seeing them as menaces because they're not licensed in any way. So I kind of like the idea of bringing that back, because in reality there's no way a cop or a fireman is going to let a guy in a suit run into a building.
"I like the idea that after they have stopped a mugging they have to run away for the police. That old-fashioned superhero thing."
Kick-Ass 2 will be released in cinemas in 2013.
Watch the trailer for Kick-Ass below: