“Momentus, Master of the Moon!”
Dr. Ezaak becomes Momentus when experimenting with gravity.
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Superman #355 (1939) is issue #355 of DC's Superman (1939–1986), with a cover date of January 1981. Written by Cary Bates and drawn by Curt Swan.
Credits, characters and story details from the Grand Comics Database, CC BY-SA 4.0.