The Secret Kingdom The Secret Kingdom is a 1917 silent action movie serial. Details Casts Posters Title The Secret Kingdom Release Date 1917-01-01 Runtime 01 Hours 32 Minutes Genres Adventure Romance Production Companies Unknown Production Countries Charles Richman... Prince Philip / Phil Barr... Dorothy Kelly... Madame Savatz... Joseph Kilgour... The Prime Minister... Arline Pretty... Princess Julia... William R. Dunn... Juan... De Jalma West... Count Ramon... Original Size (610x915)