TV Series | | Action, Fantasy, Sci-Fi
In 19th century Wyoming, a U.S. marshal discovers a secret futuristic underground city run by a supervillain bent on conquering the surface. Originally aired as part of NBC's Cliffhangers TV series which featured three revolving serials.
This series was essentially a remake of the 1935 matinée serial, The Phantom Empire (1935), starring Gene Autry.
Originally broadcast as part of the series "Cliffhangers".