Rick Gassko is about to marry Debbie Thompson. Her parents hate him. Her old boyfriend hates him. They all have money and he gets a cut of the crap games on the catholic school bus he drives. His friends decide to give him the bachelor party of all bachelor parties with an expensive hotel, booze, movies and hookers. As the players catch wind of the elements of the party, each adds a little monkey wrench so that one set of hookers ends up giving demos at the bride's shower, the brides friends end...

Stranded in 1955, Marty McFly receives written word from his friend, Doctor Emmett Brown, as to where can be found the DeLorean time machine. However, an unfortunate discovery prompts Marty to go to his friend's aid. Using the time machine, Marty travels to the old west where his friend has run afoul of a gang of thugs and has fallen in love with a local schoolteacher. Using the technology from the time, Marty and Emmett devise one last chance to send the two of them back to the future.

Marty McFly, a typical American teenager of the Eighties, is accidentally sent back to 1955 in a plutonium-powered DeLorean "time machine" invented by slightly mad scientist. During his often hysterical, always amazing trip back in time, Marty must make certain his teenage parents-to-be meet and fall in love - so he can get back to the future.