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.
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CAST
Richard Bailey
Lance Reardon
Linda Stirling
Claire Forrest
Roy Barcroft
Capt. Mephisto
Kenne Duncan
Sidney Brand
Forrest Taylor
Prof. William Forrest
Forbes Murray
Prof. Harry Hargraves
Jack Ingram
Edward Armstrong
Harry Strang
Frederick "Fred" Braley
Ed Cassidy
Paul Melton
?
Frank Alten
John Raymond
Lane Chandler
Police Insp. Reed
Russ Vincent
Ruga
Dale Van Sickel
Barker / Ritter / Lewis / Frazier / Sardon
?
Tom Steele
Lyons / Bailey
?
Duke Green
Spencer Harvey
