Back to the Future Part II (1989)

Marty McFly and Doc Brown travel to the future—2015—to prevent a disaster involving Marty's future children. However, things take a turn when Biff Tannen, their nemesis, uses a sports almanac to alter the course of history, creating a dystopian alternate 1985 where Biff reigns supreme. Marty and Doc must race against time to correct the timeline by traveling back to 1955 and stopping Biff before the future is ruined forever.