A team of astronauts is sent to the moon to rescue an alien who is seeking help to save her dying race. They are attacked by a force of bandit robots and discover that enemy spies are out to kill the alien.

After a nuclear war, four warriors from Earth awaken on a space ship. Unable to determine what purpose they are there and, above all, who rescued them, panic breaks out. The young scientist Lee and his attractive colleague Susan face the killer aliens in a bitter struggle for the survival of mankind.