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
Mooreuncredited
Harry Burns
Pirateuncredited
Louis Caits
Henchmanuncredited
Ed Cassidy
Passenger Ship Captain #2uncredited
Willy Castello
Eddie Foster
Guarduncredited
Jerry Frank
Mole Men Rebel Leaderuncredited
Robert Frazer
Passenger Ship Captain #1uncredited
Joseph W. Girard
Newspaper Editor at Meetinguncredited
Herman Hack
Frank Hagney
Ambulance Driveruncredited
Harry Harvey
Toni's Kidnapperuncredited
Reed Howes
Pencil-Mustached Cortez Thug Leaderuncredited
Frank Lackteen
Pedrouncredited
Carl Mathews
Fishing Captainuncredited
Milburn Morante
Bearded Pirateuncredited
Jack Perrin
Ambulance Attendantuncredited
Josef Swickard
Passenger Ship Doctoruncredited
Robert Walker
Dying Mole Manuncredited
Blackie Whiteford
Andyuncredited
Roger Williams
Clara Kimball Young
Cortez Hotel Maiduncredited