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
Crewman Miller
Local Man
Girl by Pool (uncredited)
Crewman Mitchell