Byron Morrow

Roger Harris

William Leahy

Judge Swenson

The Doctor

Mr. Westphal

Marshall Dunn

Secretary of State (uncredited)

Judge Hunt

Mr. Burrows

Massey's Attorney (uncredited)

Adm. Nimitz

Mental Patient (uncredited)

Studio Executive (uncredited)

Farrell

Ted Thatcher

Irving Patrick

Eugene W. Towne

George Greenleaf / Ray Fahasateur

John McLinton

Dr. Cowan

Keith Milland

Mr. Jameson from Chicago (uncredited)

Station Commander

Max Benson

Commisioner Grant

Amos Lawrence

Brigadier General

Secretary of State

Priest-Secretary

Leonard - College Regent (uncredited)

Admiral Haines

Mr. Bowers

Mr. Finletter

Mr. Gregory

Gilbert

Col. Newcomb

Admiral Westervliet

Admiral Komack

Alfred E. Chambers

Majordomo

General Moore

General Alton

Dean Watson

Dr. Harris

Agent 37

Frank Patton

Sheriff Clark

General Squires

Captain

Dr. Gordon Miller

Franklyn Buckley

John C. Cavanaugh

Air Force Major

General Fredricks

Leland Hagerman

Charles Lee Horne

Leith Houser

Gen. Beauregard

Mayor Hall

Newscaster (uncredited)

Judge Cornwall

Evacuee from Newhall

Meyers

Capt. Keith Gregory

The Commissioner

Board member (uncredited)

Martian

Speaker

Sheriff Crowell

Henry Hansen

Amos Judd

George Ranger

Judge #2

Captain Hillman

Second Judge

Judge Brawley

Mr. Baker