as Sir Bedivere (uncredited)
as Detective
as Gideon Spillet
as Captain (uncredited)
as Decker - Boss
as Sheriff Gilchrist
as Politician (uncredited)
as Roper - Jeff's First Mate [Chs.1-2, 5-8]
as Morelli
as Ringmaster (uncredited)
as Charles Bentley
as Fred Mallen
as Cash Jennings
as Red Robert
as Paul Radcliffe
as Federal Man
as Sheriff
as Corporal (uncredited)
as Keeler
as Syndicate Man (uncredited)
as Sheriff Jed Hawkins
as Lester Ward
as Bruce Carter
as Swede (uncredited)
as Merlin's Chauffeur (uncredited)
as Lefty - Henchman [Chs.1-4,7-9]
as Stanley Rand
as Lieutenant Commander (uncredited)
as Seabee (uncredited)
as Vic Hardy
as Mounted Cossack Officer
as Police Capt. Reilly
as Mine Boss
as Jim Laren
as Captain (Uncredited)
as Tom Sneed
as Nick Joel
as Barrett's Aide
as Roger Bigsby
as Henchman Lucky Cramer
as Mr. Long
as Captain of Guard (uncredited)
as Patrol Captain
as Sir Lancelot
as Ship's Purser
as Unspecified Saboteur
as George Millarde
as Ed Hammond
as RCMP Sergeant Dickson
as Utah Kid
as Jeff Carson
as Fenton
