What happens
Superman learns that a Japanese agent has hidden high-explosive charges in the Metropolis bomber plant and the great steelworks outside the city, both set to go off at six o'clock. He races to find and remove the bombs, then tracks a Japanese submarine heading toward Tokyo with the stolen formula. The episode is part 14 of The Adventures of Superman, originally broadcast on December 9, 1942.
Metropolis, the bomber plant and steelworks outside the city, and a Japanese submarine at sea during the Second World War.
Characters: Superman, Clark Kent, Perry White, General Ritz-Portkopter, Hector, Sukiyaki
Listen for: Superman locating the hidden bombs in the bomber plant and steelworks before six o'clock, and his confrontation aboard the submarine.
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.