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"I'm a huge fan of zombie movies," he told Seth Meyers on Thursday's episode of "Late Night."
He continued:
"I love the [George] Romero movies, especially. But I don't like the way zombie movies end. Most zombie movies are about a group of interesting people doing interesting things: fighting zombies. And then, the time runs out. They're like, 'Well, that was a lot of fun. We're all gonna die now. We're gonna run off into the sunset. You'll never see us again.' So I wanted to do a story about how these people continue to survive and find food and how messed up it makes them over a long period of time."
Basically, as Meyers summarized, Kirkman wanted "a zombie movie that never ends."
Watch the interview below.