Tom Tryon

Capt. Richmond Talbot

Brian Keith

Maj. Gen. John M. Vanneman

Edmond O'Brien

McClosky aka 'Mac'

Dany Saval

Lyrae

Bob Sweeney

Sen. Henry McGuire

Tommy Kirk

Walter Talbot

Kent Smith

Secretary of the Air Force

Sarah Selby

Mrs. Talbot

Nancy Kulp

Nutritionist Officer

Bert Remsen

Brennan

Harp McGuire

Federal Security Driver

Simon Scott

Medical Officer

Robert Brubaker

Space Flight Technician (uncredited)

Walt Davis

Air Force Officer (uncredited)

Douglas Evans

Colonel (uncredited)

Sally Field

Beatnik Girl in Lineup (uncredited)

Michael Garrett

Control Board Technician (uncredited)

Bob Hastings

Motorist (uncredited)

Jonathan Hole

Hotel Clerk (uncredited)

John Holland

Joe McCord (uncredited)

William Hudson

Space Flight Technician (uncredited)

Kenner G. Kemp

Conventioneer in Hotel Lobby (uncredited)

Nancy Kulp

Space Flight Nutritionist (uncredited)

Muriel Landers

Fat Lady (uncredited)

Harp McGuire

Federal Security Driver (uncredited)

Karen Norris

Bridge Player (uncredited)

Nelson Olmsted

Police Officer Dennis (uncredited)

Jeffrey Sayre

Conventioneer in Hotel Lobby (uncredited)

Bert Stevens

Conventioneer in Hotel Lobby (uncredited)

Chet Stratton

Captain (uncredited)

Arthur Tovey

Conventioneer in Hotel Lobby (uncredited)

Guy Wilkerson

Conventioneer in Elevator (uncredited)

Jo Anne Worley

Beatnik Girl in Lineup (uncredited)

John Zaremba

Security Officer Conducting Lineup (uncredited)