The story reached its climax high above the Triskelion as the Insight Helicarriers began their countdown to mass execution. While Falcon and Maria Hill worked to sabotage the fleet, Steve faced Bucky on the final carrier. Despite being beaten and bloodied, Steve refused to kill his friend. "I'm not gonna fight you. You're my friend." "You're my mission!" Bucky roared, slamming his metal fist into Steve's face. "Then finish it," Steve replied. "Because I'm with you 'til the end of the line."
A political thriller needs a human anchor, and The Winter Soldier finds its soul in the tragic reincarnation of Bucky Barnes (Sebastian Stan). Captain America- The Winter Soldier