The heroine had little time for romancing newspaper reporter Walter Jameson, what with Doctor X, alias Marcus Del Mar, threatening American democracy in general and master detective Craig Kennedy's designs for a new torpedo in particular. Whenever Doctor X has Elaine or Jameson in his grasp, they are inevitably saved in the nick of time by a mystery figure garbed in black.
Pearl White
as Elaine Dodge
Creighton Hale
as Walter Jameson
Lionel Barrymore
as Marcus Del Mar / Mr. X
Arnold Daly
as Detective Craig Kennedy
Warner Oland
as
Bessie Wharton
as Aunt Josephine
George B. Seitz
as
Betty Borden
as
Howard Cody
as
Paul Everton
as
Robin H. Townley
as
Louis Wolheim
as
