Throughout the trilogy, the DeLorean and its duplicates created via time travel make fifteen trips through time, thirteen on-screen. They are: 1) Doc's dog, Einstein, is sent one minute into the future to test the machine. 2) Marty travels to 1955 from 1985. 3) Marty returns to 1985 from 1955. 4) Doc travels to 2015 from 1985. 5) (Not seen on-screen) Doc travels to some point beyond 2015 to learn that Marty's family has unraveled. 6) (Also not on-screen) Doc travels to 2015 from the future to find the beginning of the unraveling of Marty's family. 7) Doc returns to 1985 from 2015. 8) Doc takes Marty and Jennifer forward to 2015 from 1985. 9) Biff travels from 2015 to 1955 to give himself the sports almanac, thus creating an alternate timeline. 10) Biff returns to 2015 from 1955. 11) Doc, Marty, and Jennifer return to the alternate 1985 from 2015. 12) Marty and Doc travel back to 1955 from the alternate 1985 to get the sports almanac from Biff. 13) Doc accidentally travels from 1955 to 1885 when the DeLorean is hit by lightning. 14) Marty travels from 1955 to 1885 to rescue Doc. 15) Marty returns to 1985 from 1885. A sixteenth (fourteenth on-screen) time travel voyage is made by Doc and his family in the Time Train from the future to 1985 to introduce Marty and Jennifer to Jules and Verne, and to give Marty an undamaged photo of him and Doc Brown in front of the clock. Additional off-screen time travelling has occurred as stated by Doc Brown (presumably in both the DeLorean and the Time Train), but these are the sixteen confirmed travels.

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