Credits
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As Dr. Cygnus Layton
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As Dr. Bryant
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As Commodore Carlson
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As Drake
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As Vero (uncredited)
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As Daniels (uncredited)
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As Captain Hornsby
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As Brigadier General (uncredited)
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As Prof. Millard
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As Henry Mills
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As Dr. Bryant
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As Stage Actor Playing Philip Mannings
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As Swenson (uncredited)
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As M. De Treville
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As Commishioner Litchfield
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As Prof. James Clayton [Chs. 1, 10-12]
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As Prof. Millard
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As John Wheeler
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As British Major
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As Interpreter (uncredited)
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As Cal Sutton
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As Mordigan
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As Dr. George Strong
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As Cavalier (uncredited)
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As Bismo - Annabella's Friend (uncredited)
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As Winsley (uncredited)
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As Bidwell
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As Mr. Winters
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As Ace Diamond
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As Dr. Cyrus Layton
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As Commissioner Robert George Hardy [Chs. 5-7]
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As Major Morris
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As Officer (uncredited)
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As Guard (uncredited)
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As Thomas (uncredited)
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As Fire Warden
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As Joseph Rand
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As Lloyd Chapin
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As Ship's Radio Man (uncredited)
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As Ivan Shark
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As Giovanni (Uncredited)
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As Dan Slocum
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As Instructor
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As 'Dandy' Darnell
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As Captain in Car (uncredited)
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As Abel Bellamy