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I don't know. I just want to make a new informative topic. I didn't know if this topic already exist.
Anyway, no matter what. I just couldn't think of any topic.

This thread is for X-Men Alternate Universes alone. Post anything related to it. Individual pictures/bios, crossovers, etc... are all welcome.

May I start with this one:

Days of Future Past

The alternate timeline called "Days of Future Past" was first introduced to the readers by Chris Claremont and John Byrne in 1981. In this timeline, mutants were pursued by the Sentinels, and killed, one by one.

Alternate Universes:
Main marvel universe (earth 616)
Ultimate Universe.
Days of Future Past.
Age of Apocolypse.
Bishop's Future
Cable's Future
Here Comes Tommorrow Future
Mutant X
Earth X
1602
Exiles (includes many alternate universes)
Dimensions 794, 4872, 4873, 4871, 238, 1629 & 8158 (mentioned in the Chaos Engine Trilogy)