A U.S. secret agent is sent to the distant space city of Alphaville where he must find a missing person and free the city from its tyrannical ruler.
In a near future, the American secret agent Lemmy Caution travels to Alphaville posing as the journalist Ivan Johnson from the Figaro-Pravda newspaper. His mission is to find the missing agent Henry Dickson and to convince Professor von Braun to come with him to Nueva York. Prof. von Braun is actually Leonard Nosferatu and has created the powerful computer Alpha 60 that has conceived the inhuman dystopian society of Alphaville, where love, conscience, poetry and emotion have been banished and words are systematically eliminated from the dictionary. Alpha 60 is also omnipresent and Lemmy has the assistance of Natacha von Braun, who is the daughter of von Braun. Soon he falls in love with Natacha but he needs to complete his mission before leaving Alphaville.