When Superman made his debut in Action Comics #1, his origin was limited.
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His alien origins just got a brief mention in the crowded origin page.
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Siegel and Shuster then did a Superman comic strip that revealed Kal-L's name.
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Superman #1 re-told the origin of Superman for the first time.
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It added in the Krypton part, but did not use any of the character names.
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A 1942 Adventures of Superman novel by George Lowther introduced the name Kal-El.
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The Jor-El spelling was adapted into the comics in the late 1940s.
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By 1960, Superman's Kryptonian name, Kal-El, was now featured in the comics.
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