"...going for a big sci-fi style thing with 'X-Men: Days of Future Past', said Millar. "It’s 'X-Men' meets 'The Terminator'..."
"You’ve got robots, you’ve got time travel, you’ve got superheroes – it’s got everything in one film."
"Days Of Future Past" adapts Marvel Comics' "Uncanny X-Men" (1981) issues #141 and #142, written by Chris Claremont and illustrated by John Byrne.
The story alternates between present day, in which the 'X-Men' fight the 'Brotherhood of Evil Mutants' led by mutant shape-shifter 'Mystique', and a future timeline caused by the X-Men's failure to prevent the Brotherhood from assassinating 'Senator Robert Kelly' :
"...the story begins 30 years in the future. In the 'present' the year is 1980, and 'Kitty Pryde' has just joined the X-Men. While in the 'future' 'Kate Pryde' is a middle-aged women running for her life, trying to meet up with an elderly 'Wolverine' in a now-destroyed New York City. The future is bleak; an assassination of a presidential hopeful senator in 1980 led to a series of events that allowed the robotic 'Sentinels' into taking over North America. The Sentinels are ready to move overseas to spread their control world-wide, but the rest of the world is ready to launch nuclear weapons to prevent that from happening. The surviving 'X-Men', who are very few, are 'Storm], 'Colossus', 'Wolverine', newcomer 'Rachel' and Kate herself. They are assisted by 'Magnus- Magneto', confined to a wheelchair..."
"The Days of Future Past' storyline was also adapted for the "X-Men" Animated TV series, with another alternative future story, focusing on bounty hunter 'Bishop' and the idea of a traitor within the ranks of the team.
Click the images to enlarge, Sneak Peek "X-Men: First Class" and from the "X-Men" Animated TV series, the episode "Days of Future Past"...