In 1938, Lieutenant Buck Rogers (Buster Crabbe) and Buddy Wade (Jackie Moran) are part of the crew of a dirigible flying over the North Pole. They are caught in a savage storm and crash. They are ordered to release the experimental Nirvano Gas, which (unbeknownst to them) will put them in suspended animation until they are rescued. The Nirvano Gas works, but the dirigible is buried in an avalanche and is not found until 500 years have passed. When Buck and Buddy are found, they awaken in the year 2440 to a world ruled by the ruthless dictator, Killer Kane (Anthony Warde), and his army of “super-racketeers”. Only those who live in the “Hidden City”, run by the benevolent scientist Dr. Huer (C. Montague Shaw) and his military counterpart, Air Marshal Kragg (William Gould), resist the criminal rulers of Earth.

[Public Domain?] https://www.youtube.com/watch?v=CsIZXTxn36A