Lost Planet Airmen is a 1951 black-and-white American science fiction film produced and distributed by Republic Pictures, which is actually the feature film condensation of their 1949 12-chapter serial, King of the Rocket Men. Lost Planet Airmen was directed by Fred C. Brannon and written by Royal K. Cole and William Lively. The lead actors in Lost Planet Airmen were Tristram Coffin and Mae Clark. Plot Professor Millard (James Craven), a scientist who is a member of the group Science Associates, works in a secluded desert location in a cave laboratory on a secret research project. Reporter and photographer Glenda Thomas (Mae Clarke) is curious about that secret project. When she tours the Science Associates building, she meets Burt Winslow (House Peters, Jr.), the project's publicity director, and Jeff King (Tristram Coffin), a research project member. The mysterious "Dr. Vulcan" is intent on stealing the various weapons being developed by the scientists of the Science Associates group. Vulcan hopes to make a fortune by selling these valuable devices to foreign powers. Dr. Vulcan's gang kills one of the scientists. To stop Vulcan and his operatives, Jeff dons a newly developed, atomic-powered rocket backpack, mounted on a leather jacket, which has a streamlined flying helmet attached that hides his identity. With the assistance of Dr. Millard, he continually foils the attacks by Vulcan's henchmen. Vulcan plots to destroy New York City using a sonic ray device, which will cause massive earthquakes and flooding. Only "the rocket man" ultimately stands in his way and unmasks Vulcan, exposing his real identity, while thwarting his diabolical plan of destruction. Cast Tristram Coffin as Jeff King aka Rocket Man Mae Clarke as Glenda Thomas Don Haggerty as Tony Dirken House Peters, Jr. as Burt Winslow James Craven as Dr. Millard I. Stanford Jolley as Professor Bryant Stanley Price as Gunther Von Strum Ted Adams as Martin Conway Marshall Bradford as Dr. Graffner Dale Van Sickel as Martin (archive footage) Tom Steele as Knox, a thug (archive footage) David Sharpe as Blears (archive footage) Eddie Parker as Rowan (archive footage) Michael Ferro as Turk (archive footage) Frank O'Connor as Warehouse Guard (archive footage) Production Lost Planet Airmen used scenes from King of the Rocket Men, which had been more cheaply made than previous Republic serials. Creating a compilation feature film allowed Republic to have another opportunity to exploit the serial for further profit; the studio's prospects