A large city has been completely evacuated. An alien force of robots has invaded the city and is destroying all mankind! Frank (Richard Denning) and a handful of strangers wake up to the empty city and band together. Not only must they escape the robot patrols, but also they must contend with a psychotic killer amongst them. All the while scientists are racing against the clock to save earth from annihilation. Based on the short novel, The Deadly City by Paul W. Fairman.