Doctor Who was a big part of my childhood so it was a great honour to be in it.

The trouble with improv is that it is often about being funny in the moment without any real consideration for the bigger picture.

Suddenly, the world I had scrutinised for so long was all around me, as if I had leaned forward and climbed into the television like Alice through the looking-glass. I had no idea just how deep the rabbit hole would go.

I used to lie in bed in my flat and imagine what would happen if there was a zombie attack.

We've kind of grown up in a post-Star Wars era, and what Star Wars did to cinema, in terms of an explosion of that kind of blockbuster culture. It's thrown up a generation of geeks. With the evolution of computer games and the Internet, that's all impacted on us as a generation, and affected the creative element of that generation enormously. So whereas the different schools of filmmaking...

We realised that it was important to embrace this popcorn logic, that it works, that it's funnier when you fire 20 rounds from one tiny pistol. Then it becomes the joke, it's funnier when you pay less attention.

Chris Martin's a good friend of mine. I'm actually Apple's godfather. He's an old friend and we've been mates for quite a few years now.