Mala
饰：Agent Ray Mala
雷克斯
Rex
饰：Rex, the Wonder Horse (as Rex the Wonder Horse)
Buck the Dog
Buck the Dog
饰：Buck
Mamo Clark
饰：Princess Melani
赫伯特罗林森
Herbert Rawlinson
饰：Grant Jackson
William Newell
饰：Hank McGlaurie
John Ward
饰：Anthony Tupper
约翰·迪尔森
John Dilson
饰：E.G. Ellsworth
塞尔默杰克逊
Selmer Jackson
饰：Mr. Canfield aka H.K.
John Picorri
饰：Porotu (as John Piccori)
鲍勃·科特曼
Bob Kortman
饰：Gang Yacht Capt. Wilson (as Robert Kortman)
George Cleveland
饰：Goebel, Gang Scientist
Lloyd Whitlock
饰：Lamar, Headquarters Gang Member [Chs. 1-6]
Tiny Roebuck
饰：Eppa the Wrestler
Tracy Layne
饰：Larkin, Gang Chalkboard Monitor
Herbert Weber
Herbert Weber
饰：Stevens
Anthony Pawley
Anthony Pawley
饰：Clark, Dying Man on Clipper Island
Allen Connor
Allen Connor
饰：Jim Taylor, Infiltrator [Chs. 10-11]
Frazer Acosta
Frazer Acosta
饰：Teekar, Porotu's Chief Henchman (uncredited)
Don Brodie
饰：Dirigible 'San Francisco' Radioman [Chs. 1, 11] (uncredited)
Ed Cassidy
饰：Joe Davis, Intelligence Chief [Ch. 10] (uncredited)
Allan Cavan
饰：Captain of Dirigible 'California' [Chs. 13-14] (uncredited)
埃德蒙·科博
Edmund Cobb
饰：Crosby,Harris (uncredited)
Lester Dorr
饰：Dirigible 'California' Officer [Ch. 14] (uncredited)
Val Durand
饰：Half-Caste Drummer (uncredited)
弗兰克·埃利斯
Frank Ellis
饰：Rontree, Sailor-thug in Stocking Cap (uncredited)
Roscoe Gerald
Roscoe Gerald
饰：Price, Cave Thug in Visor (uncredited)
Henry Hale
Henry Hale
饰：Mercer, Cave Thug at Desk (uncredited)
Oscar 'Dutch' Hendrian
饰：Grover, Gang Headquarters Majordomo [Ch. 12] (uncredited)
F. Herrick Herrick
饰：Sub Captain Tollar (uncredited)
David Horsley
饰：Grover's Co-pilot,Agent Ed Varne (uncredited)
Jack Mack
Jack Mack
饰：Fosdick,Manning (uncredited)
Charles Marsh
饰：Dirigible 'San Francisco' Asst. Radioman [Chs. 1, 11] (uncredite
Allen Mathews
饰：Agent M-2 [Ch. 11] (uncredited)
Ralph McCullough
饰：Goebel's Lab Assistant (uncredited)
Charles McMurphy
饰：Inspector O'Hara [Chs. 10-11] (uncredited)
巴德·奥斯博内
Bud Osborne
饰：Ellis, Mate (uncredited)
Eddie Phillips
饰：Ellsworth's Male Secretary [Chs. 1, 9-10] (uncredited)
Loren Riebe
饰：Johnson, Seaman [Ch. 7] (uncredited)
Buddy Roosevelt
饰：Wireless Operator (uncredited)
杰克·斯图尔特
Jack Stewart
饰：Police Sergeant [Ch.10] (uncredited)
Harry Strang
饰：Grover, Gang Pilot [Chs. 4-6] (uncredited)
Henry Sylvester
饰：Fairchild, Captain of Dirigible 'San Francisco' [Chs. 1, 11] (un
Al Taylor
饰：Marco, Sailor-Thug in Officer's Hat (uncredited)
Evan Thomas
饰：Agent 1 (uncredited)
Larry Thompson
Larry Thompson
饰：Agent 2 (uncredited)
Francis Walker
Francis Walker
饰：Spy (uncredited)
Chee-Ak
饰：Agent Ray Mala
George Chesebro
饰：Draker - Island Operations Chief