Jimmy Hunt
David Maclean

Arthur Franz
Dr. Stuart Kelston

Helena Carter
Dr. Pat Blake, MD

Leif Erickson
Mr. George MacLean

Hillary Brooke
Mrs. Mary MacLean

Morris Ankrum
Col. Fielding

Walter Sande
Police Sgt. Mack Finlay

Bert Freed
Police Chief A.C. Barrows

Milburn Stone
Army Capt. Roth

Douglas Kennedy
Officer Jackson

Charles Cane
Officer Blaine

Fay Baker
Mrs. Wilson

Janine Perreau
Kathy Wilson

John Eldredge
Mr. Turner

Barbara Billingsley
Kelston's Secretary

Richard Deacon
MP

Lock Martin
Mutant Carrying David to 'Intelligence'

Todd Karns
Jim the Gas Station Attendant

Frank Wilcox
Pentagon Chief of Staff

Robert Shayne
Dr. William Wilson

William Phipps
Sgt. Baker

William Forrest
Col. Mayberry

Peter Brocco
Brainard (bit)