With the help of a wacky scientist, a young teen travels back to 1955 in a Delorean turned time-machine. Once there, he meets his parents, still teenagers, but his presence throws things out-of-whack and he must ensure they fall in love and get married or else he'll never come to exist.
Back to The Future Part II
Things have barely settled from the excitement and resolve of the original Back to the Future, when in pops that crazy inventor Dr. Emmett Brown (Christopher Lloyd) with news that in order to prevent a series of events that could ruin the McFly name for posterity, Marty McFly (Michael J. Fox ) and his girlfriend are whisked into the future to the year 2015.
Back to The Future Part III
The final installment in the Back to the Future trilogy picks up where the second film left off, but it casts off the dizzying time travel of the first two films for mostly routine comedy set in the Old West.