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The Rocketeer-looking guy is Adam Strange; he's an old fashioned Flash Gordon-style outer space hero.
The purple guy is one of the Challengers of the Unknown, I think. They're a team that does crazy super-science adventures with time travel and alternate dimensions and shit.
Neither of them are particularly major to the story, and are mostly just there to showcase the old-school silver age setting (in the movie, at least--in the comic they get a nice explanation of who they are and what they do).
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