When a young boy makes a wish at a carnival machine to be big—he wakes up the following morning to find that it has been granted and his body has grown older overnight. But he is still the same 13-year-old boy inside. Now he must learn how to cope with the unfamiliar world of grown-ups including getting a job and having his first romantic encounter with a woman.
Girdharilal (Kader Khan) is a very rich and wealthy man. He has made a number of enemies. One of his enemies asks a beggar to masquerade as Girdharilal for a price, to which the beggar agrees. The switch takes place, with the real Girdharilal being abducted. A series of hilarious and comical events take turn as the beggar attempts to pretend to be a rich, left-handed tycoon.
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.