Mike Connors
Dr. Nancy Burnham
Keach
Sid Bream
Diane Cafferty
Simpkins
Sgt. Tulley
Alan Stanton
MP 1
MP 2
Steve Elkins
Dr. Shoup
Chelsea
General Cartwright
Chambers (Head of NASA)
Gonzales
Sheriff Morgan
Deputy Ferguson
Mr. Norton
Crewman Terrance
A space shuttle crashes containing a lethal prototype organism designed to survive in any environment. The only people who can stop the creature are the Secretary of Defense agent and the female scientist who created it.