Characters played by Stephen McNally
Sam Hurley
Characters played by Alexis Smith
Kay Garven
Characters played by Jan Sterling
Dorothy 'Dottie' Vail
Characters played by Keith Andes
Larry Fleming
Characters played by Arthur Hunnicutt
Asa Tremaine
Characters played by Paul Kelly
Bart Moore
Characters played by Robert Paige
Arthur Ashton
Characters played by Richard Egan
Dr. Neal Garven
Characters played by Frank DeKova
Dummy
Characters played by Fred Aldrich
Hunter - Driver of Car
Characters played by Benny Burt
Hunter
Characters played by John Cliff
Gas Station Attendant
Characters played by Dick Crockett
Air Force Helicopter Pilot
Characters played by John Diggs
Colonel at Control Station
Characters played by William Forrest
Colonel Wright
Characters played by Fred Graham
A.F. Captain in Helicopter
Characters played by Karen Hale
Nurse
Characters played by Clark Howat
Lieutenant at Control Station
Characters played by Nelson Leigh
Scientist at Control Station
Characters played by Frank Marlowe
Reporter Charlie
Characters played by David McMahon
Hunter
Characters played by Nestor Paiva
Pete
Characters played by Alex Sharp
Sgt. Trooper
Characters played by Bill Wallace
Driver