For decades now, Michael J. Fox. But at the time of its shooting, that wasn’t so clear for Fox, who was famously parachuted in at the 11th hour after actor Eric Stoltz was let go from the role. That, and shooting simultaneously with sitcom Family Ties, left him exhausted and afraid that he’d be terrible.

Famously, he was anything but. Except, having only seen the finished film twice, it took a long time for Fox to realise that, he tells Empire in a major new interview. “I saw it back when it came out, at the Cinerama Dome, which was insanity, then I hadn’t seen it in its entirety until a couple of years ago,” he says. “It was Christmas. We were decorating the tree… I went to go get something from the kitchen and I was gone quite a while. Tracy came and found me and I was watching TV.