Eighties teenager Marty McFly is accidentally sent back in time to 1955, inadvertently disrupting his parents' first meeting and attracting his mother's romantic interest. Marty must repair the damage to history by rekindling his parents' romance and - with the help of his eccentric inventor friend Doc Brown - return to 1985.

A scientific experiment unknowingly brings extraterrestrial life forms to the Earth through a laser beam. First is the cigar-smoking drake, Howard, from the duck's planet. A few kids try to keep him from the greedy scientists and help him back to his planet, but then a much less friendly being arrives through the beam...