Captain America and the Black Widow investigate an attack on S.H.I.E.L.D., and then enlist the help of a superhero called the Falcon after the agency is compromised.
Chris Evans, Scarlett Johansson, Samuel L. Jackson, and Cobie Smulders from "How I Met Your Mother" are all back from "The Avengers".
If you're not a comic book nerd, the Winter Soldier isn't Captain America, it's the bad guy. (If you'd like to remain in the dark we won't spoil it for you. But if you're dying to know the Winter Soldier's identity, it's revealed in this video.)
Robert Redford is a high-ranking S.H.I.E.L.D. agent, Anthony Mackie is the Falcon, and Stan Lee has a cameo as the night watchman at the Smithsonian. As usual, you'll want to stick around through the credits for two additional scenes.
(If you have an itch to see more, here's an extended preview featuring an assault on an aircraft carrier. And if you haven't had the patience to sit through the credits on every Marvel movie, you can watch ALL of their post-credit scenes here.)