Donner and Mankewicz grafted the "turn the world back ending" onto the shooting script for Superman: The Movie. The movie was overbudget, and there were doubts that Superman II would even be made at one point, as Donner's and the Salkind's relationship had gotten really ugly. They had even brought in Lester at this point as a "go-between" for the two camps. The decision was made to end the first movie in manner not quite so set-up for a sequel, since II looked foggy at the moment.
Chris
Chris
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