Steve Rogers AKA Captain America (Chris Evans) is now a full-time agent for S.H.I.E.L.D., the high-tech law-enforcement agency led by eye-patch wearing champion of justice Nick Fury (Samuel L. Jackson). After Fury is attacked by a mysterious metal-armed assassin known as The Winter Soldier. Accompanied by agent Natasha Romanoff (Scarlett Johansson) and pal Sam Wilson (Anthony Mackie), Rogers sets out to discover who is behind the violence and finds that evil organisation Hydra has been thriving within the very walls of S.H.I.E.L.D. headquarters.