as Frank Hanlon
as Gambler (uncredited)
as Jess Fowler
as Capt. Foley
as Henchman Brannigan
as Fred
as Bill Mayberry
as Sergeant on Sidewalk (uncredited)
as Henchman Pete
as Barnett
as Narrator (voice) (uncredited)
as Croupier
as Henchman (uncredited)
as Joe Bardet
as Construction Worker (uncredited)
as Trigger Chandler
as U.S. Customs Agent Lou Evers
as Henchman Bragg
as Henchman Kirk
as Sam Priestly
as Dr. Paul Dexter
as Jay Lynch
as Paul--Deresco Aide
as Dr. Chambers [Chs. 1-2, 8]
as Marshal Frank Hammond (as Kenneth Duncan)
as Al Bartlett
as Clint Scollard
as Murder Victim (Uncredited)
as Morgan
as J.W. Carlton
as Sergeant on Sidewalk with Sgt. Collins (uncredited)
as Tanner
as The Martian Airfield Captain
as Curly Andrews
as Karl, aka Dr. Acula
as Captain Anders (as Kenneth Duncan)
as Henchman
as Steve Dallas
as Lt. Lacy
as Rustler talking with Jackson
as Airdrome Captain
as Latigo (uncredited)
as Henchman Gentry [Chs. 7, 11]
as Sheriff Jeff
as Ranch-Hand Larry
as Sgt. Gordon (as Kenneth Duncan)
as Nick
as Michael's Henchman
as Wedding Rehearsal Attendant (uncredited)
as Nat Burdell
as Henchman Brownie
as Charlie (Uncredited)
as Al Herman
as Lt. Matt Carson
as Cal Freeling
as Henchman Johnny Slade
as Car-Rental Clerk
as Frank Stevens
as Express Rider
as Ram Singh, Wentworth's Hindu Chauffeur
as Henchman Two-Gun
as Henchman Ed Rance (as Kenneth Duncan)
as Boarder
as Maj. Naylor
as Abu
as Cowboy in Saloon
as Jack
as Sidney Brand
as Ben Brady
as Bob Horner
as Asa Morgan
as George Hooker
as Geologist McBride
as Crawley (uncredited)
as Sheriff
as Hanley
as Blackie
as Ram Singh
as Henchman Leathers (as Kenneth Duncan)
as Henchman Dick Cantwell
as Henchman Turner
as Marvin
as Lefty
as Lafe
as Speed Dennison
as Office Worker (Uncredited)
as Plug
as Henchman Hackett
as Tim Reymond
as Michael Bellamy
as Adams
as Chet Adams
as Joe
as Saloon Henchman
as Sam Mantell (as Kenne Duncun)
as Henchman Jackson
as Henchman Ben Bannon
as Man in Bar (uncredited)
as Henchman Joe
as Mulie
as Dave Brewster
as Mcquaid
as Charles Mitchell
as Henchman Indigo Hubbard
as Sheriff Dan Kirk (as Kenneth Duncan)
as Tom Blaine
as Spade - Henchman
as Fred Jones (as Kenneth Duncan)
as Henchman Steve
as Chick Williams
as Blaine - Henchman
as Whitey - Henchman
as Marshal Bob Day (as Ken Duncan)
as Henderson
as Al
as Dow
as Servant
as Captain Jim Wallace
as Henchman Tom
as Bill Willis
as Ross McLain
as Henchman Adams
as Sheriff Winters
as Rance
as Henchman Felton
as Car Salesman
as (uncredited)
as Tom
as R. J. Cole (as Ken Duncan)
as Nebraska
as Henchman Pete McAvoy
as Henchman Scotty
as Brazos Kane
as Henchman Durgan (as Ken Duncan)
as Arthur Wilkes - Secretary
as Sheriff Barnes
as Bart Wallace
as Homesteader Clark
as William Murrell
as Deputy Walt
as Lance - Henchman
as Dave Hendricks
as Henchman Pete Chandler
as Rod
as John Sommerset
as Tom Bancroft
as Henchman Chuck
as Henchman Bender
as Blake Hardy (as Kenneth Duncan)
as Henchman Crandall
as Captain Clay
as Uncle Ben Allen
as Self
as Deputy Barrow
as Snyder
as Henchman Johnson
