Cain XVIII (Russian: Каин XVIII) is a 1963 film from the Soviet Union, adapted from Evgeny Shvarts' play, Two friends.

A famous inventor ("The Professor") creates an extra-powerful weapon—an explosive mosquito.

King Cain XVIII dreams of conquering the world and marrying the princess, but she is also loved by Yan, a vagrant musician.

Yan's love leads him to surmount many obstacles and simultaneously thwart the insidious plans of the king.

This article related to a Soviet film of the 1960s is a stub.