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.

---

Main Cast: Richard Bailey, Linda Stirling, Roy Barcroft, Kenne Duncan, Forrest Taylor, Forbes Murray, Jack Ingram, Harry Strang, Ed Cassidy, Frank Alten

Directors: Spencer Gordon Bennet, Wallace Grissell, Yakima Canutt

Writers: Basil Dickey, Grant Nelson, Albert DeMond, Alan James, Joseph F. Poland, Jesse Duffy

Editors: Harold Minter, Cliff Bell Sr.

Cinematographer: Bud Thackery

---

Popular Double Features