Following the end of WWII, war-monger Sir Eric Hazarias (Lionel Atwill) sets the wheel in motion for WWIII. His search for Meteorium 245, the only practical defense against the atomic bomb, leads him to mythical Pendrang. Obstructing his sinister plan to rule the world are Rod Stanton (Russell Hayden), United Peace Foundation investigator, Tal Shan (Keye Luke), Pendrang native, and Marjorie Elmore (Jane Adams), daughter of scientist Dr. Elmore (John Eldredge), unwilling assistant to Sir Eric.