Zombies will try to scale any surface no matter how unfeasable or even impossible. In all but the easiest situations, these attempts have met with failure. Even in the case of ladders, when simple hand-over-hand coordination is required, only one in four zombies will succeed.

Zombies let us explore notions of the apocalypse - no water, food, medical care, the government imploding - while letting us sleep at night.

America is especially sensitive to war weariness, and nothing brings backlash like the perception of defeat. I say “perception” because America is a very all-or-nothing society… We like to know, and for everyone else to know, that our victory wasn’t uncontested, it was positively devastating.

The dead walk among us. Zombies, ghouls-no matter what their label-these somnambulists are the greatest threat to humanity, other than humanity itself.

We live in such a service-based, globalised economy where very few people actually make anything and the people who do make stuff... it's all part of a massive global supply chain. So what if all those chains were suddenly cut, how would you make something? How would you keep people alive? And that was something I wanted to explore.

I think 'G.I. Joe' is a perfect example of how I'm the world's worst businessman. If I were smart, I'd be writing 'World War Z Part 12', but I have to go where the muse leads, and I've always been a huge 'G.I. Joe' fan. I always wanted to know more about these characters, these little plastic figures I played with as a kid.

Survival is the key word to remember—not victory, not conquest, just survival.