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In page Superman:

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Superman's success immediately begat a wave of imitations. The most successful from this period was Captain Marvel, first published by Fawcett Comics in December 1939. Captain Marvel had many similarities to Superman: Herculean strength, invulnerability, the ability to fly, a cape, a secret identity, and a job as a journalist. DC Comics filed a lawsuit against Fawcett Comics for copyright infringement.[citation needed]