The 1985 they return to has changed dramatically, with Biff now one of the wealthiest and most corrupt men in the country. He has turned Hill Valley into a chaotic dystopia, secretly killed Marty's father, George, in 1973, and forced Marty's mother, Lorraine, to marry him. Doc has also been committed to a mental hospital. Doc deduces that the 2015 Biff took the time machine to give his younger self the almanac, and Marty learns from the alternate 1985 Biff that he received it on November 12, 1955. Biff tries to kill Marty, but Marty flees and travels to 1955 with Doc.