The Sky Ranger (aka The Man Who Stole the Moon) is a 1921 American 15-episode/chapter silent film serial. Directed by George B. Seitz who also starred with June Caprice, the film serial was an adventure film with locales as exotic as Tibet. The plot staple of an inventor of aviation technology having to contend with conspirators who wish to steal the invention, often appeared in aviation films. The Sky Ranger is considered to be lost.