What happens
Ken Thurston, known as Mr. X, travels to Guatemala at the request of Dr. Alvarez, who fears a dangerous virus culture held in his laboratory. Upon arrival, Thurston learns that a test tube of cholera virus has been stolen, and he begins searching for it alongside the doctor and Professor Zender. The investigation brings him into contact with Maria Samters, the secretary Pedro Martinez, and Roger Sibley, a young Englishman. The series is The Man Called X, starring Herbert Marshall, and this episode aired on December 2, 1950 on NBC. Thurston pursues the missing culture through a tense night in the ruins of Antigua.
Antigua, Guatemala, at a government laboratory and the nearby ruins, in the early 1950s
Characters: Ken Thurston, Dr. Alvarez, Professor Zender, Roger Sibley, Maria Samters, Pedro Martinez, Captain Jose Taboso, Hilda
Listen for: Thurston's questioning of the laboratory staff and his confrontation with Pedro in the ruined house
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.