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Boris Karloff
Dr. Konrad Markesan
Dick York
Fred Bancroft
Carolyn Kearney
Molly Bancroft
Richard Hale
Prof. Everett Latimore
Henry Hunter
Prof. Angus Holden
Basil Howes
Prof. Charing
Billy Beck
Prof. Grant
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Released
Hubbell Robinson Productions
Benjamin H. Kline
Director of Photography
Donald S. Sanford
Adaptation
August Derleth
Story
Douglas Benton
Associate Producer
