Director
Elmer Clifton
DIRECTOR
Stars (in credits order)
Don Terry
Larry Kent
Gwen Gaze
Toni Morrell
Walter Miller
Carter 'The Shark' Collins
Grant Withers
Roderick Gridley
George Rosener
Capt. Samuel Cuttle
Hobart Bosworth
Dr. X
Sandra Karina
Nurse Zanya
P.J. Kelly
Prof. Gault
Yakima Canutt
Dreer (Mole-Men Leader)
William Farnum
George Brennan Westmore (Editor)
Joe Caits
Saltwater Jerry [Chs.1,4-7,13-15]
Colin Campbell
Hawkins (the Butler) [Chs. 1-3]
Dave O'Brien
Det. Jameson [Chs. 4-7]
William Royle
Paul Thorndyke [Ch.1]
Warner Richmond
Capt. Tom Stanton, alias Capt. Tom Faxton [Ch.1]
Ted Adams
Moore(uncredited)
Harry Burns
Pirate(uncredited)
Louis Caits
Henchman(uncredited)
Ed Cassidy
Passenger Ship Captain #2(uncredited)
Willy Castello
Eddie Foster
Guard(uncredited)
Jerry Frank
Mole Men Rebel Leader(uncredited)
Robert Frazer
Passenger Ship Captain #1(uncredited)
Joe Garcio
Joseph W. Girard
Newspaper Editor at Meeting(uncredited)
Herman Hack
Frank Hagney
Ambulance Driver(uncredited)
Harry Harvey
Toni's Kidnapper(uncredited)
Reed Howes
Pencil-Mustached Cortez Thug Leader(uncredited)
Frank Lackteen
Pedro(uncredited)
Carl Mathews
Fishing Captain(uncredited)
Milburn Morante
Bearded Pirate(uncredited)
Jack Perrin
Ambulance Attendant(uncredited)
Josef Swickard
Passenger Ship Doctor(uncredited)
Robert Walker
Dying Mole Man(uncredited)
Blackie Whiteford
Andy(uncredited)
Roger Williams
Clara Kimball Young
Cortez Hotel Maid(uncredited)