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Superman The Magnetic Telescope (1942)

IMDb: 7.0
1942

When police interfere with a reckless scientists experiment, it creates a deadly meteor shower only Superman can stop

Superman Eleventh Hour (1942)

IMDb: 6.1
1942

While Clark Kent is in wartime Japan, Superman becomes a saboteur

Superman Secret Agent (1943)

IMDb: 6.4
1943

Superman battles saboteurs determined to stop a lady double agent from getting important documents to Washington D C

Superman Showdown (1942)

IMDb: 6.8
1942

A crook dressed as Superman commits a series of robberies The real Superman must work fast to counter the bad publicity