What happens
Commander Buzz Corey and Cadet Happy of the Space Patrol are returning to Terra when they answer a distress call from a small cruiser. Its pilot, Lorna Stark, says she fears Carl Bracker, a former employee of her father, who wants her to reveal the hidden inventions of the late Dr. Wilhelm Yeager. The Space Patrol pursues the matter to Terra, where Bracker and his partner Merton Yost abduct Lorna. The heroes then follow the clues to Mars and the Hartog Hills, where they search for Yeager's secret castle. The episode is from the Space Patrol series, first broadcast on 1954-02-13, and is part of its Revenge of Dr. Yeager storyline.
Space and the planets Terra and Mars, including Terra's city, a repair shop on Newton Street, and a hidden castle in the Hartog Hills of Mars
Characters: Buzz Corey, Cadet Happy, Lorna Stark, Carl Bracker, Merton Yost, Dr. Wilhelm Yeager, Major Robertson
Listen for: Lorna Stark revealing that Yeager's castle is in the Hartog Hills on Mars, and the discovery of the castle's hidden levitation beam and mirror corridor
Written from the episode itself; it never gives away the ending. Every recording is remastered for the stream: cleaned of rumble, hiss and mains hum (and the old TV whine where we found it), then levelled in two passes to steady broadcast loudness, so one show is never quieter than the next.