“Twice Upon a Time!”
Superman helps re-unite two time travelers who crashed on Earth. Mr. Alpha gets a hold of some technology from these time travelers and causes trouble.
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Superman #354 (1939) is issue #354 of DC's Superman (1939–1986), with a cover date of December 1980. Written by Cary Bates and drawn by Curt Swan.
Credits, characters and story details from the Grand Comics Database, CC BY-SA 4.0.