15) I Am Legend (2007)

I Am Legend has its alternate ending flipped. While in the theatrical version, Robert Neville sacrifices himself with a heroic explosion that kills him in order to save the cure and humankind from the mindless monsters of the Darkseekers, the alternate ending depicts them as only trying to save one of their kin, making them slightly complex and humane. It finally dawns on Neville that he is the villain and leaves quietly. This shocking twist completely changes the nature of heroism and overhauls the entire moral heart of the story.
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Edited by Tanisha Aggarwal