What happens
In Hollywood, Captain Tex Bradford and Mrs. Gregory plan to capture the Euclidean scientists before their magnetic submarine locks lose their hold. Elaine, the Euclidean submarine commander, proposes a daring idea: she and Captain Bradford will fly the rocket plane back to Euclidea at once, carrying containers of the captain's formula to suspend against the locks. Johnson, Jerry and Joan are left to prepare the rescue boat and help Mrs. Gregory. The group rushes to load supplies and prepare for the dive, aware that time is short and that the Euclideans may soon be free.
Hollywood, California, and the underwater Euclidean city beneath the Magic Island
Characters: Captain Tex Bradford, Mrs. Gregory, Johnson, Elaine, Jerry, Joan, Pat, John
Listen for: Elaine's plan to fly back to Euclidea with the formula, and the six-hour deadline set before the Euclidean locks lose their magnetism
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.