BRUCE GENTRY--DAREDEVIL OF THE SKIES (1949). Compilation of a 15-chapter serial.

Bruce Gentry is an aeronautic ace who now works in air charters. Dr Benson , a friend of charter pilot Bruce Gentry, is kidnapped by the mysterious enemy agent, "the Recorder" who only issues orders through recordings. Benson is used to perfect the villain's flying saucers, launched and controlled by electronic means. Industrialist Paul Radcliffe hires Bruce to investigate the saucers as he thinks they may have a commercial use.

Necessary for the production of the flying saucers is a mineral called Platonite. The Recorder's only source, an abandoned mine on the land belonging to Jaunita and Frank Farrell has run dry and he needs to steal supplies from the US Government. Gentry tries to stop the Recorder's plans and discover his identity. These are the first UFOs appearing in a film.