The Phantom Empire is a 1935 American Western serial film directed by Otto Brower and B. Reeves Eason and starring Gene Autry, Frankie Darro, and Betsy King Ross. This 12-chapter Mascot Pictures serial combined the Western, musical and science-fiction genres. The duration of the first episode is 30 minutes, while that of the rest is about 20 minutes. The serial film is about a singing cowboy who stumbles upon an ancient subterranean civilization living beneath his own ranch that becomes corrupted by unscrupulous greedy speculators from the surface. In 1940, a 70-minute feature film edited from the serial was released under the titles Radio Ranch or Men with Steel Faces. This was Gene Autry's first starring role, playing himself as a singing cowboy. It is considered to be the first science-fiction Western.

William Reeves Eason, known as B. Reeves Eason, was an American film director, actor and screenwriter. His directorial output was limited mainly to low-budget westerns and action pictures, but it was as a second-unit director and action specialist that he was best known. He was famous for staging spectacular battle scenes in war films and action scenes in large-budget westerns, but he acquired the nickname "Breezy" for his "breezy" attitude towards safety while staging his sequences—during the famous cavalry charge at the end of Charge of the Light Brigade (1936), so many horses were killed or injured so severely that they had to be euthanized that both the public and Hollywood itself were outraged, resulting in the selection of the American Humane Society by the beleaguered studios to provide representatives on the sets of all films using animals to ensure their safety.