Britannica Sources used in this answer

Who created Superman and when did the character first appear in Action Comics?

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Christopher Reeve as Superman flies over a city at night, wearing a blue suit with a red cape and yellow belt, from the 1978 film Superman. — Superhero Christopher Reeve in *Superman* (1978).

Superman was created by writer Jerry Siegel and artist Joe Shuster for DC Comics. The character made his first appearance in Action Comics no. 1, which was published in June 1938.21