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.

Disaster strikes as a specialised team of investigators struggle to find out the truth about a strange monolith which sends out an intercontinental signal.

In the near future the US Government has created an elite team of soldiers specially trained for action in the event of a hostile alien encounter. A multi-national force, they are the last line of defense

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.

The roguish soldier Anthony Rand follows a ruthless general back through time in a last ditch attempt to save the universe.