First Trailer: 'Captain America 2'

With Thor: The Dark World about to swing into theaters, Marvel is ramping up promotion for their next big movie: Captain America: The Winter Soldier.

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Set in a post-Avengers world, the modern-day sequel sees Steve Rogers teaming up with Natasha Romanoff to battle a powerful yet shadowy enemy in present-day Washington, D.C.

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Described by all involved as more of a political thriller than straight-up action movie, the trailer reveals tons of governmental intrigue thanks to Robert Redford's Alexander Pierce, but doesn't skimp on the insane action, thanks to the return of -- spoiler alert! -- Sebastian Stan's Bucky Barnes, who now bares a much more menacing moniker! Watch!

Captain America: The Winter Soldier opens April 4, 2014.