Marvel's Avengers (2013)

S2E4 Ghosts of the Past

Title: Echoes of the Past Plot: Red Skull possesses vital intel that could aid the Avengers in their battle against Thanos, but before they can get to him, an unexpected assailant abducts him. Captain America uncovers that the culprit is his former ally, Bucky Barnes, now transformed into the Winter Soldier, who has returned with a thirst for vengeance.