Screenwriter Laeta Kalogridis said that the main inspiration of the film was the second half of Ritorno al futuro - Parte II (1989) where Marty McFly (Michael J. Fox) ended up visiting an alternate 1985 after the older Biff Tannen's (Tom Wilson) visit to 1955. They also used the best moments from the first two films as a base for their story. Kalogridis and Patrick Lussier originally turned down the offer to write this film three times because they did not like the storyline for the third and fourth installments without affecting the first two films.

Film

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