Michael J. Fox Recalls Sitting Next to Princess Diana at 'Back to the Future' Premiere

— -- The premiere of "Back to the Future" was a huge moment for Michael J. Fox professionally.

It was noteworthy because of personal reasons, too.

"We were sitting in the theater waiting for the royals to come in and I realize that the seat next to me is empty, and it dawns on me that Princess Diana is going to be sitting next to me," he said in a trailer for an upcoming documentary, "Back in Time." "The movie starts and it occurs to me that I'm a fake yawn and an arm stretch away from being on a date with the Princess of Wales."

"Back in Time," a documentary about "Back to the Future," features interviews with Fox, Lea Thompson, and Christopher Lloyd, as well as director Robert Zemeckis, and executive producer Steven Spielberg. "Back for the Future" premiered 30 years ago.

"It really is for me," said Spielberg, "inarguably the greatest time travel movie ever put on film."

"Back in Time" will be available on VOD, DVD and in select movie theaters Oct. 21.