In the decades that have passed since the trilogy ended, Back to the Future has spawned comic books, animated shows, theme park attractions, video games, documentaries, and tons of movie merchandise. Its two sequels, Back to the Future Part II and Back to the Future Part III, were also well received by audiences, and the trilogy as a whole is now viewed as one of the greatest in cinema history (while the likes of The Dark Knight and Planet of the Apes come very close). Will there be a Back to the Future remake? But the rest is history - Back to the Future opened to a roaring success, impressing critics and cinemagoers alike. And so Fox was cast as Stoltz's replacement, however, several reshoots were required which cost the film an additional $4 million and the delay of its initial release. With Fox unavailable at the time, actor Eric Stoltz was cast as the time-traveling teenager, but a humorless portrayal forced the filmmakers to look for someone with more zest. Fox is now synonymous with the role of Marty McFly, it wasn't his from the get-go (although he was always the first choice). The third and final entry in the series sees Marty go all the way back to 1885 for a Wild West adventure, where he must save Doc from a duel with a local outlaw and also find a way back to the future. The sequel sees Doc, Marty, and his girlfriend Jennifer travel to the future world of 2015, where their actions inadvertently lead to an alternate '1985' reality. If you aren't familiar, though, the trilogy revolves around time travel, with teenager Marty using a time-traveling DeLorean to journey from 1985 to 1955, where he accidentally gets in the way of his parents' first encounter, thus threatening his own existence.