Mr. Prime Minister is a political satire. The movie follows the story of Johnny Master (Dev Anand), an elderly happy-go-lucky man who survived the earthquake of Kutch. Johnny loses his memory, but gets close to the villagers and soon the villagers elect him as their leader. However, Johnny is abducted by his rivals and is tortured by them. He soon gains his memory back and realizes that he is the owner of a huge business empire. How Johnny fights back after he regains his memory forms the rest of the plot.