Back to the Future's time machine was a fridge in the first draft, and Ghostbusters' original casting choice for Venkman was John Belushi rather than Bill Murray--even the classics go through huge changes from first draft to final cut. For James Gunn's The Suicide Squad, the big change was the villain; instead of Starro, at one point the plan was to have the Squad face off against Superman (via AV Club).

Gunn went on the Script Apart podcast recently to talk about developing the script for The Suicide Squad. There, he said that he initially believed that the Squad should fight Superman, and that it would be "a very interesting story."

Ultimately, though, he went with a bigger surprise in the form of Starro, a giant, cosmic starfish.