Back To The Future director Robert Zemeckis claims another sequel simply can’t happen. Back To The Future was the brainchild of Zemeckis and writing partner Bob Gale, and tells the story of a teenager named Marty McFly, who accidentally finds himself transported back to 1955 in a time-travelling DeLorean. The movie had something of rocky production, with Marty originally being played by Eric Stoltz. After a month of filming, Zemeckis decided Stoltz had been miscast, with his performance being too intense and dramatic.

Since Marty features in nearly every scene, all of Stoltz's footage needed to be reshot. Luckily, Michael J. Fox - Zemeckis' first choice - became available, and filming went smoothly from there. Back To The Future became a big critical and commercial success, with praise being given to the performances and the movie’s seamless blend of comedy and adventure. Back To The Future Part II and Part III were filmed back to back and released in 1989 and 1990 respectively. While the sequels didn’t receive quite the same acclaim as the original, the entire trilogy is still beloved by fans.

Related: New Poll Suggests Americans Really, Really Want Back To The Future 4

Zemeckis and Gale intended to end the Back To The Future saga with these sequels, and a clause in their contract means another movie can't happen without their approval. The two men have held firm on their belief there doesn’t need to be another installment, however, and in a new interview with Yahoo!, the filmmaker had the following to say on a recent poll revealing audiences would love more Back To The Future.

But I think what the poll is saying… they asked a specific question, so I guess they felt it was important to spend money to poll the world and ask this question, but don’t you think we could all have just given them the same answer? It confirms what we all know, but what I think the fans are really saying is that we really like this movie and if it were possible I’d like more of it. But they understand that it can’t be done.

While Back To The Future has continued on in the form of video games and a cartoon series, there’s never been any attempt to mount another sequel. The story is wrapped up fairly neatly at the end of the third entry, and while the time-travel conceit allows for further stories, there’s something refreshingly self-contained about the series. Zemeckis has been quoted as saying he won’t allow another movie in his lifetime, and while he understands fans would love more, he probably realizes that would only lead to disappointment.

Back To The Future is one of the few major franchises that haven’t been remade or rebooted. Even Star Wars - where George Lucas once ruled out further movies following the end of the prequel trilogy - was relaunched with 2015’s The Force Awakens. Unless Zemeckis and Gale are pitched an awesome idea that completely changes their opinion on the subject, it seems Back To The Future will remain a trilogy for the foreseeable future.

More: Back To The Future Cast Reunites 33 Years Later In New Photo

Source: Yahoo!