6) Terminator 2: Judgment Day (1991)

The alternate ending of Terminator 2 presented a much darker destiny for the humans. In the original cut, Sarah Connor views a brighter future for her son John, since the world has avoided the apocalypse. The original ending was, however, to demonstrate that judgment day was inevitable and could not be stopped by Skynet's destruction. More importantly, the brighter ending is adopted with the machines' threat fully obliterated, thus leaving the characters in hope. This brought about a better ending than could have been obtained from a grim ending that would have otherwise made the film less iconic.
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