Winter Soldier (Marvel's Avengers)

Winter Soldier also known as James Buchanan Barnes, Jr., or Bucky for short is a playable character in Marvel's Avengers. A best friend of Captain America back in World War II who was thought to have died in a battle, later resurfaced as a brainwashed super soldier until he is freed by one of his old friends in 21st century.

He was initially first mentioned via Marvel's Avengers: The Extinction Key before debuting as a playable character.