That’s a tough one… I’d say it’s probably the Dark Phoenix Saga.  Really great story, with a really powerful ending. The interesting thing about it is that I recently read the “Phoenix: The Untold Story,” where they show what the original ending was for X-Men 137, where Jean survived, and the whole story kind of fell flat.  Without that double-reversal at the end, where Jean suddenly regains her powers and wins the fight, and then offs herself, it’s just a story about the X-Men getting beaten up by some random space dudes, and then nothing happens.  It’s really anti-climactic… which… I suppose is what happens when you remove the climax, huh? It just goes to show how every piece of a story is important, and how just a few changes can make or break even the best stories. 

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