than George's supervisor. Despite 1955 Doc's insistence on not knowing details of the future, a note Marty leaves in his pocket on November 12, 1955, prevents him from being killed by the terrorists. In the film's final moments, Doc Brown appears in a modified version of the DeLorean and tells Marty and his girlfriend Jennifer Parker that they must travel to the future to fix a problem caused by Marty and Jennifer's kids. Back to the Future Part II (1989) The series continues as Doc Brown travels with Marty and Jennifer to the year 2015, where he has discovered Marty's family is in ruins. Shortly after rectifying the situation, Marty buys a sports almanac containing the outcomes of 50 years (1950–2000) worth of sporting events to make easy money. However, Doc talks him out of it and throws the almanac in the trash bin, where the 2015 Biff Tannen finds it. A sleeping Jennifer has been taken by police to her future home, needing Marty and Doc to retrieve her before returning to 1985. While Marty and Doc are at the 2015 McFly home, 2015 Biff steals the DeLorean time machine and gives the book to his 1955 self just before he goes to the dance at the end of the first film. When Doc and Marty return to 1985, they find that Biff has used the sports almanac's knowledge for financial gain, which allowed him to turn Courthouse Square into a casino with 27 floors, take over Hill Valley, get away with the murder of Marty's father, and later marry Marty's mother. Marty learns that Biff was given the book by 2015 Biff on November 12, 1955, so he and Doc go back to that date in order to steal the almanac from Biff before he can use it to destroy their lives. They accomplish this in a complex fashion, often crossing their own past selves' paths. When the duo is about to travel back to 1985, a lightning bolt strikes the DeLorean and activates the time circuits, sending Doc back to 1885 and leaving Marty stranded once again in 1955. Back to the Future Part III (1990) After finding out that Doc Brown was trapped in 1885, Marty and the 1955 Doc find and fix the DeLorean. Learning that Doc gets shot in 1885 by Biff's great-grandfather, the outlaw Buford "Mad Dog" Tannen, Marty travels back in time