Stephen Boyd
Grant
Acting
Raquel Welch
Cora
Acting
Edmond O'Brien
General Carter
Acting
Donald Pleasence
Dr. Michaels
Acting
Arthur O'Connell
Col. Donald Reid
Acting
William Redfield
Capt. Bill Owens
Acting
Arthur Kennedy
Dr. Duval
Acting
Jean Del Val
Jan Benes
Acting
Barry Coe
Communications Aide
Acting
Ken Scott
Secret Service
Acting
Shelby Grant
Nurse
Acting
James Brolin
Technician
Acting
Brendan Fitzgerald
Wireless Operator
Acting
Brendon Boone
Military Policeman (uncredited)
Acting
James Doohan
Dr. Sawyer (Hypothermia technician) (uncredited)
Acting
Kenneth MacDonald
Henry - Heart Monitoring (uncredited)
Acting
Christopher Riordan
Young Scientist (uncredited)
Acting