Twelve Monkeys plot
"The future is history."
After five billion people were wiped out by a virus in 1996, humanity (or what is left of it) will be living underground by 2035. Convicted James Cole is sent back in time to research the virus so that a fight can be worked on. However, he ends up a few years early, in 1990, where of course nobody believes his story. He ends up in an institution where he finds Dr. Kathryn Railly met. She slowly begins to believe in his story. Cole, however, begins to doubt his own sanity more and more.