5. Quicksilver Lives - Avengers: Age Of Ultron
Some Marvel fans were shocked when Quicksilver was killed to protect Hawkeye and a civilian, sacrificing himself to save them and sending his sister into a spiral of anguish. It was a surprisingly brave moment - particularly in terms of the studio's tendency to avoid killing character's off - but in bucking their trend they actually sabotaged a superior ending. It's probably not surprising to learn that there was an alternate ending that would have seen things playing out in a totally different way, though: in one discarded ending, Quicksilver - despite being shot to pieces - makes it to through to the Avengers enlistment process in one piece. As writer/director Joss Whedon once explained:
"We did actually shoot him in the last scene, in an outfit, with his sister. We also shot him, waking up, saying, 'Ah, I didnt really die from these 47 bullet wounds!'"
Given that Quicksilver never had a chance to shine, keeping him around instead of killing him would have been preferable: after all, he wasn't developed enough to invoke much concern from movie-goers upon his death. Plus, it's just a waste of an iconic character.