"I'd sort of thought that after 'X-Men: The Last Stand' (in 2006)," he said. "After that, with 'First Class,' I thought it was my last time doing Iceman. So with 'Days of Future Past,' I think I always sort of had that last go-round idea in the back of my head. There's only so many times you get to fly around in a black leather outfit, so I try to enjoy every minute of it."