An out-of-control robot is inadvertently set loose in a small community, and a crack squad of soldiers are sent to hunt it down. Gradually, the members of the squad begin to suspect that some of them are robots.

A time-travel experiment in which a robot probe is sent from the year 2073 to the year 1973 goes terribly wrong thrusting one of the project scientists,into a plague ravaged alternate time-line whose war weary inhabitants are locked in a constant battle with killer robots from the future.