George Dressler

General Sharman

Dr. August Claiborne

Jersey Callum

General Stone

Victor Handler

Governor Neilson

Dr. Michael Rossi

George Dobbs

Carl Strickland

President Harry S. Truman

Mike Danvers

Joseph Locordolos

Mark Kane

Philip Mulwray

Mr. Clarkson

Dr. Mike Wise

George Beldridge

Dr. Michael Rossi

Chandler Dietrich

Admiral Harry Pearson

Ray Hollister

Robert Denby

Carlton James

Major John Alexander

Lt. Calvin Zenger

Gene Kranz, Flight Director

Paul Reston

Nick Staffo

Warren Cole

Carl Nesbitt

Dr. Harden

Paul Hamilton

Dr. Martin Becker

Cole Marteen

James Priest

Captain at Nightclub Announcing Call-up of Officers (uncredited)

Nick Richards / Pete Jensen

Brundage

Dino Michaelis

Art Lacroix

Alex Hendricks

Norm Britt

Sid - Henchman (uncredited)

Dr. Paul Kettering

Rick Connor

Dave Randall

Guard (uncredited)

Blonde Tribe Member

Police Officer 'Dutch' / Blind Man

Cannon

Tom

Etienne (as Edwin Nelson)

Pete

Ensign Quinlan

Police Sergeant

Charlie