1966: S.H.I.E.L.D. sends secret agent Ran Shen to collect two Nazi scientists with the key to winning the Cold War. But the Soviets want the scientists as well, and have unleashed their most dangerous operative: the Winter Soldier, aka the brainwashed and presumed-dead partner of Captain America - Bucky Barnes! His mission: acquire the scientists by any means necessary...or kill them. The only things in the Winter Soldier's way are an elite Hydra squad run by Chancellor Cassandra and Madam Worm...and his own returning memories!