Fritz Marberg
Robert Marvin
Larry Ballentine
Tommy Randall
Finlay
Stanley Moorehead
Homer Smith, aka Juniper Jones
Philip Bosinney
Oliver Bradford
John Davis
Edward 'Eddie' Crane
Richard Blake
Langdon Towne
Jeff Cohalan
Brooks Mason / George Smith
Jimmy Bradshaw
John Stafford
Cuffy Williams
Charles 'Slim' Martin
Grand Duke Peter
Tony Milburn
Alec (Son)
Harry King
Harry Moulton Pulham
Douglas Lamont
Peter Carlton
Larry Kelly
Claude William Hope
Little Mike Stone
Gottfried Lenz
David Linden
Hugh McKenzie
Rudolph 'Rudi' Pal
Ricardo
Gordon Evans as a young man
Doctor James Merrill
Gene Anders
Kip Tarleton
Roger 'Rog' Ash
Tom Wakefield
Andre Vallaire
Geoffrey Aiken
Jeff
Vernon 'Vern' Walsh
Dan Craig
Nick Buckley
Charley Phelps
Bob Stuart
Bobby Preble
William 'Bill' Drexel
Bill Harrison
Lieut. (JG) 'Brick' Walters
Marco Ricca, also known as Marco Smith
Henry 'Hank' Sherman
Anton Erban
Judge Charles Raleigh
David Naughton
Dr. Andrew Sheldon
Michael Morgan
Larry Scott
Alex Hazen
Ralph Thomas
Fritz Hagedorn
Dick Ogden
Capt. Fitzroy
Jack Bristow
Will Connelly
Randolph Haven
Self (uncredited)
Tony Ferrera
Preston Patton
Narrator
Neil McGill
Stephen Tracy Adams
Marcus Welby
Pat
Dr. Marcus Welby
Pierre Brassard
Tony Spear
Hank
Student at Dance / at Beach (uncredited)
Dr.Claudet
(archive footage) (uncredited)
Lt. Hurley 'Hank' Travers
Myles Vanders
Joe Woldarski
Samuel Magee
Himself
Jimmy Blake
James Anderson
Joe Smith
Jack Forrester
Joe Hatcher
Radio Announcer (uncredited)
Self
Graham - Pilot Reporting Missing Airplanes (uncredited)
Jim Fowler
(archive footage)
Self (archive footage)
Roswell Gilbert
Jim Anderson
Lieutenant Commander Knowles
Self - Host
Sen. Earl Gannon
Self - Guest
Dr. Gilbert Winfield
Mr. Laurence
Herman Allison
Self - Recipient
Self - Mystery Guest
Nick Holloway
Self - Panelist