as Bob Russell
as Herbert Thornhill
as Captain Amos Karnes
as Basil Demarest
as Nick Grindell
as The Bronco Kid, alias of Drury
as Argo
as Karlotti
as Kimble
as Tony
as Weaver
as Utah Becker
as Lieutenant Patten
as Durkin
as Carson
as Prof. Hobart Zorn
as Manning
as Gangster at Lodge Wanting to Quit (uncredited)
as First Mate (uncredited)
as Lt. Patten
as Pete Stenner
as Laughing Maxey
as A.R. McCrae
as Stevens, gang chemist
as Repen
as Bertram Van Twiller
as Murdock
as Walton
as Ed Wilder
as Army Officer
as (uncredited)
as Jim Thorne
as Henry Jethrow
as 'Dapper Bill' Ballard
as Hawk Miller
as Henchman Ace Barko
as Luther Spence
as Ramsey Kane
as Henry DeLong
as Major Jenkins
as Doane
as Joe
as Freighter Mate [Chs. 7-8]
as Lord Argo
as John Bland
as Lawrence Mayfield (uncredited)
as Wyman
as Kincaid
as Benson
as Julie's Kidnapper (uncredited)
as Lieut. Douglas Thompson
as Porter
as Willy St. John
as Jim Dawson
as Willie Durant aka Robert Wallace
as "Trigger" Stratton
as George
as Tarnak
as Tracy
as Kirby
as Capt. Carlisle Pemberton
as Nicholay
as Hatch Engall
as Van
as Rowdy Townsman (uncredited)
as Judson Ward
as Lord Markham (uncredited)
as Fight Announcer
as 'Poker' Wilson
as Roger Bradley
as Bob Arnold
as John Evans
as Wallace
as Sam
as Jim Fremont
as Bobby Ralston
as Dr. Gordon White
as Fred Burns
as 'Lucky'Jim Seymour
as Steve
as Director
as Wheeler
as Joe Heller / Lew Heller (uncredited)
as Cmdr. Lawson
as Stephen Hartley
as Blackie Miller
as Mile-Away-Harry
as Jim Murray
as Duke Foster
as Moreland
as Kerrigan
as Eddie 'Mile-Away' Skeeter Carlson
as Weary
as Ace Morgan
as Hardy
as Sheriff Clem Norton
as Chief Swift Wing
as Alex Ballard
as Peter Burke
as Manny
as Panther Fielding
as 'Lucky' Wilder
as Delmar Spavinaw
as Brady
as Shotgun Jones
as Bourbon Drinker on Train
as Real Montgomery Irving
as Dreamer
as John Ritter
as Concho
as Toledo Eddie Marchetti
as Mike Corney
as Dr. Jack Martin - the Man in the Case
as Gregory Stone
as Duval
as Manager
as Holt Norbo - Bank Cashier
as Philip Wells
as Detective
as Burr Gordon
as Abbott
as The captain
as Shanghai Morgan
as Slippy McGee
as Anton Lebau
as Brophy
as Dick Randall
as Jack Raymond
as Poe Powers
as Jo Sprague
as Kurt Walters
as The Revenue Officer
as Etienne Cloquet
as Scruff Mackenzie
