In the second episode of The Adventures of Superman radio series (1940), although Superman has been sent to Earth as an infant, he arrives here as a full-grown man in his costume! In this clip featuring Bud Collyer as Superman, after rescuing a man and his son trapped in a runaway train, he acquires the name Clark Kent and the idea to become a newspaper reporter.

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Above: A 1940 ad for the radio show. Bud Collyer's photo alternates with the ad (just move the mouse).