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comics - Who was the first Marvel superhero who was an active part of two different superhero teams? - Science Fiction & Fantasy Stack Exchange
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First Marvel Universe details revealed: You play as Marvel characters, it's free to play, and more! | PC Gamer
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Marvel Comics | Marvel Super-Heroes issue #18, with first appearance of the Guardians of the Galaxy, CGC graded 5.5 (1969) | Artsy
Who was Marvel's first superhero character, and how has that character evolved throughout the company's history? - Quora
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