Throughout the trilogy, the Delorean and its duplicates created via time travel make 15 trips through time. They are: - 1) Doc's dog, Einstein, is sent one minute into the future to test the machine. - 2) Marty travels back to 1955 from 1985. - 3) Marty returns to 1985 from 1955. - 4) Doc travels past 2015 from 1985. - 5) Doc travels to 2015 from the future to find the beginning of the unraveling of Marty's family. - 6) Doc returns to 1985 from 2015. - 7) Doc takes Marty and Jennifer forward to 2015 from 1985. - 8) Biff travels from 2015 to 1955 to give himself the sports almanac, thus creating an alternate timeline. - 9) Biff returns to 2015 from 1955. - 10) Doc, Marty, and Jennifer return to the alternate 1985 from 2015. - 11) Marty and Doc travel back to 1955 from the alternate 1985 to get the sports almanac from Biff. - 12) Doc accidentally travels from 1955 to 1885 when the Delorean is hit by lightning. - 13) Marty travels from 1955 to 1885 to rescue Doc. - 14) Marty returns to 1985 from 1885. It could be argued that the Delorean made a 14th trip through time: being placed in the mine by Doc in 1885 for Marty and Doc to find in 1955. However, it did not actually time travel (i.e. "skip" any period of time) in that instance. - 15) Doc and his family travel from the future to 1985 to introduce Marty and Jennifer to Jules and Verne, and to give Marty an undamaged photo of he and Doc Brown in front of the clock. Additional off screen time traveling has occurred as stated by Doc Brown, when he tells Marty that he has "already traveled further ahead into time to see what else happens" in
Back to the Future Part II (1989).
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