3/15/1973
In the alternate 1985 created by Biff Tannen using a stolen sports almanac, George McFly was shot and killed by Biff on March 15, 1973 — leaving Lorraine trapped in a forced marriage and Hill Valley under Biff's corrupt rule. This is the dark timeline Marty and Doc must unravel: the film's vision of what a single selfish act can do to an entire community.