Attack The Block thrilled crowds at Comic Con, and it’s not hard to see why. A film produced by Edgar Wright, who directed Shaun of the Dead and Hot Fuzz, about aliens attacking a council estate in the hood in South London is an instant draw for geeks looking for a witty turn to alien invasion movies. But it’s not just for geeks. ATB also boasts an impressive cast of young actors on the level of Super 8 and a fast-paced script filled with comedy, suspense and heart.

Trashwire had the chance to sit down with writer/director Joe Cornish and star John Boyega at Comic Con to talk about the film.

The performances from the kids are so impressive and they have such natural chemistry. Can you tell us about the casting process? 

Cornish: We saw about 1,500 kids and there was a huge amount of talent to choose from. We have 11 kids in this film from the ages of 10 to 17 and almost none of them had ever had any on-camera acting experience before. I was really excited to put new faces on the screen. The wonderful thing about pop culture is there’s a new generation coming all the time and they want their own generation of stars. I wanted to give an opportunity to young actors who hadn’t had much experience and also, because the film was set where it was, it seemed like a great opportunity to give kids a break who maybe wouldn’t necessarily find themselves with the support and background to do this. I was the least experienced guy on the set, so to have this group of kids who were as naive, passionate and enthusiastic as I was was really comforting. Whenever I felt insecure or doubted it, I could just feed off their passion for the idea.

Boyega: It was amazing and it was great hanging out with the boys. We had amazing energy, I don’t know where that energy came from. I’m a guy that likes his sleep, but at 5am, you’d be rapping and singing songs and having a Pokemon competition. It was fun-filled, kidish energy and we just had fun. We drove the crew crazy.

Having a first-time feature film director and so many first-time actors, were Wright and the studio heavily involved in every aspect?

Cornish: There was a lot of faith required for this movie. We had monsters, we had explosions, we had stunts, we had effects, there were night shoots, we even had a dog in it! Edgar said to me, “Joe, you’re doing everything you’re not supposed to do. You’re making this hard for yourself.” But I thought I would only have one shot at making a movie, so why not aim high. Edgar was busy working on Scott Pilgrim, so had had no choice but to have faith in me. He couldn’t get involved too deeply, and that was quite useful because he could step into the process with complete objectivity. He’s been a friend for 12 years or something crazy like that and I’m amazingly loyal to him. It’s a testament to sticking with your friends.

How was it for you transitioning from being a theatre actor to being in your first movie?

Boyega: With stage, the audience is right in front of you, so it was hard to imagine how people were going to react when you’re on the set with just the camera in front of you. I have so much respect for actors that do film because sometimes you may be shooting a scene and they call cut, but you still have to stay in it. I have huge respect for the crew. The amount of work that goes into films is amazing and that’s what took me back. I have no right to be a diva in the future. Not only would my mom knock me off the block, but the amount of work these guys do is amazing. I just love cinema and the way it works.

When you go to screenings, are you pleased by the audience reaction?

Boyega: I’ve watched various screenings back in the UK and it’s been very lovely, but in the USA, you guys are very proactive when you’re watching a film, you’re very much involved. The audience makes you feel like you’re watching something, like it’s real. I remember watching a screening at the ArcLight and [my character] Moses is talking about how he’s going to go out and face the aliens and how it’s his fault and the audience was like, “You tell ‘em, Moses! You tell ‘em!” There was cheering when I walked into the Q&A. I get tweets about it. I love that! I love being in a verbal audience and that surprised me entirely.

What was the most exciting new experience for you?

Boyega: It went down to little things like having a sausage on the set and everything being technically marked. I’ve always been a movie buff, the guy that buys the two-disc special edition and watches the second disc more than the first. I’ve always wanted to be that guy–like Shia LaBeouf sitting there with a scratched up hoodie and blood on his face talking about the film in an interview–and when I got that opportunity, it felt like “Yes! This is going to be great!”

The dialogue is really authentic, did the kids help shape that part of the script?

Boyega: There were certain parts where I was like, “no, kids don’t say that,” but I have to say, being a British actor, I’ve read a lot of urban scripts in my time and this is the closest to reality, the closest point blank. I liked it because I’ve been in those situations where you see kids being scared–it’s not an alien, maybe it’s a dog or something–and the fear just makes them say something like “it’s too much madness to explain in one text” or “I feel like going home and playing FIFA.” That felt really, really natural to me.

The creature design was different from most alien invasion movies. How did you come up with the concept of how you wanted these aliens to look?

Cornish: When I first came up with the concept for the film, the response was, “well, it’s a good idea, but you can’t do it for less than $30 million because you have to have CGI creatures and you can’t afford CGI creatures.” But I had an idea of how to do it without that. Basically, the core idea is using a rotoscope technique to actually removed detail and flatten the creature because I had this crazy theory that rotoscope is almost like primitive motion capture, because it’s based on human movement. I figured it would blend better with action than CGI does because, however brilliantly CGI is done, it’s animation and animation never really sits realistically. It works in Mary Poppins or Roger Rabbit where it’s heightened and stylized, but the physics aren’t there. Ralph Bakshi’s Lord of the Rings was very big to me as a kid an I thought, “hmmm, there could be something here.” We had no idea how audiences would respond. We knew we were trying to appeal to audiences who were used to CGI stuff who had learned to be satisfied with that aesthetic.

Was it easier to perform with the rotoscope method instead of a CGI monster that isn’t really there?

Boyega: It was fantastic because Attack the Block is an homage to 80s movies where it would be a practical effect and the alien would be on set. Joe is a big John Carpenter fan and Steven Spielberg fan, so we had the aliens on set.

What were some of the biggest inspirations for the movie?

Cornish: All these 80s monster movies: Gremlins, Critters, Tremors, Predator. In Predator, you think it’s a war movie and then it reverses itself. And then the other big influences were gang movies. I’m a huge fan of The Warriors, Rumble Fish and The Outsiders. That links to the whole Carpenter thing with Assault on Precinct 13 and Halloween. I’ve wanted to make a movie since I was 13, I’m 42 now, so there’s a lot of stuff inside me waiting to come out.

Attack the Block is out now in limited release, but we’re keeping our fingers crossed it comes to more cities soon. Everybody deserves a chance to see this awesome film! Boyega and Cornish may have been first-timers, but we’re looking forward to seeing a lot of great films from both of them in the future.