"Back to the Future" fans will remember October 21, 2015 as the date that was "the future" in the classic '80s film. To mark the date, Toyota and agency Droga5 have reunited the film's two stars, Michael J. Fox and Christopher Lloyd, for an ad based around the movie. The full version won't break until October 21 for obvious reasons, but the teaser, seen here, breaks today and features the pair discussing what "Back to the Future" got right. The brand has a connection with the original movie, thanks to Marty's truck, and the new spots promote its Mirai hydrogen fuel cell car. But exactly what Toyota has in store, you'll have to wait to see until next week.