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X-Men: Days of Future Past wasn't the first with time travel theme.

Did it bring something different? What was the innovation?

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It wasn't by a long shot. The earliest writings on time travel go back to the Mahabharata, the earliest comic I can reference is All Star Comics issue 10 from 1942 where:

The Justice Society of America uses a time ray to travel 500 years into the future in order to secure an effective defense system with which to protect America against bombing attacks.

I'll leave the discussion about whether X Men DOFP was innovative to others, not my area of knowledge.

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