One initial idea for the sequel had the first two acts the same, but the third act had Biff giving his younger self the almanac in the 1960s, not in 1955. When Marty went back to stop him, he ran into his parents again (who were now hippies) and almost stopped his own conception. Robert Zemeckis decided that it was too similar an idea to the first film, and George and Lorraine would have been too old to be hippies. He came up with the idea of revisiting the original Ritorno al futuro (1985) from different angles with the two Martys in 1955.

Film

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