The Master Key
B&W : Serial / 31 reels
Directed by Robert Z. Leonard
Cast: Robert Z. Leonard, Ella Hall, Harry Carter, Alan Forest, Jean Hathaway, Alfred Hickman
The Universal Film Manufacturing Company, Incorporated, production; distributed by The Universal Film Manufacturing Company, Incorporated. / Scenario by Calder Johnstone, from the novel The Master Key by John Fleming Wilson. / Fifteen episodes (two reels each):  released 16 November 1914 (three reels). / Standard 35mm spherical 1.33:1 format.
Survival status: The film is presumed lost : Print exists in the Library of Congress film archive [episode 5 only].
Current rights holder: Public domain.
Keywords: Miners - Mines - Serials
Listing updated: 17 March 2012.
References: Edmonds-BigU pp. 40, 41, 42; Lahue-Bound pp. 23, 49; Lahue-Continued pp. 21-22, 158, 286; Stedman-Serials p. 14; Tarbox-Lost p. 232 : Website-SerSq : with additional information provided by Kim Fahlstedt.