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

Max Wagner

Army Sgt. Rinaldi

Charles Gibb

Lt. Blair

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

Gil Herman

Major Clary

Luce Potter

The Martian Intelligence

Lock Martin

Mutant Carrying David to 'Intelligence'

Max Palmer

Second Mutant Guarding the "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)