What happens
Jerry and Joan are trapped in the Euclidean laboratory with G-47, the submarine commander, and the chemist, as the Euclideans work to compound Captain Bradford's formula. When the lab is filled with a sleep-producing gas, Jerry and Joan slip away, setting off an alarm and moving through an elevator and tunnels toward the pier. Their escape brings them to the yacht and Johnson's boat, where they find that both vessels have been holed, and Mrs. Gregory begins radioing for help to Wilmington.
The Euclidean island base, its laboratory, elevator shaft and tunnels, and the pier where the yacht and Johnson's boat are moored near Los Angeles.
Characters: Jerry, Joan, G-47, Captain Bradford, Mrs. Gregory, Pat, Johnson
Listen for: The gas in the laboratory, the sounding alarm gong, and Joan's escape route through the tunnels to the pier.
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.