A growing source of silent era film information.
This listing is from The Progressive Silent Film List by Carl Bennett.
Copyright © 1999-2013 by Carl Bennett and the Silent Era Company.
All Rights Reserved.
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The Great Radium Mystery
B&W : Serial / 18 episodes
Directed by Robert Broadwell and Robert F. Hill
Cast: Cleo Madison, Robert Reeves, Eileen Sedgwick, Robert Kortman, Edward Brady, Jeff Osborne (Jeffrey Osborne), Robert Gray, Gordon McGregor, Fred Hamer
The Universal Film Manufacturing Company, Incorporated, production; distributed by The Universal Film Manufacturing Company, Incorporated. / Scenario by [?] Frederick Bennett. / 18 episodes:  “The Mystic Stone,” released 13 October 1919. / Standard 35mm spherical 1.37:1 format.
Survival status: The film is presumed lost.
Current rights holder: Public domain.
Listing updated: 23 January 2004.
References: Lahue-Continued pp. 68, 193-194, 285; Stedman-Serials p. 47 : Website-IMDb; Website-SerSq.