44
About
Claire Forrest seeks her kidnapped scientist father, hidden somewhere on Mystery Island. He is held and forced to work on diabolical inventions by Captain Mephisto, a costumed villain.
Theatrical
Mar 17, 1945
Budget
$168K
Directors
Writers
Producer
Music
Mort Glickman
Studio
Republic Pictures
Where to Watch
Region
Plex
Watch free
HD
Included
Plex Channel
Watch free
HD
Included
Fandor
Stream included
HD
Included
Cineverse
Stream with ads
HD
Included
The Roku Channel
Stream with ads
HD
Included
See all 9 options →
Prices last updated October 2, 2026. Pricing and availability may vary by region.
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Cast
Full credits →R
Richard Bailey
Lance Reardon
L
Linda Stirling
Claire Forrest
R
Roy Barcroft
Capt. Mephisto
K
Kenne Duncan
Sidney Brand
F
Forrest Taylor
Prof. William Forrest
F
Forbes Murray
Prof. Harry Hargraves
J
Jack Ingram
Edward Armstrong
H
Harry Strang
Frederick "Fred" Braley
E
Ed Cassidy
Paul Melton
F
Frank Alten
John Raymond
L
Lane Chandler
Police Insp. Reed
R
Russ Vincent
Ruga
D
Dale Van Sickel
Barker / Ritter / Lewis / Frazier / Sardon
T
Tom Steele
Lyons / Bailey
D
Duke Green
Spencer Harvey
