Captain America Poster #48 Bucky-Cap Avengers John Romita Jr Winter Soldier

James Buchanan Bucky Barnes...sidekick to Captain America, later a Russian operative named Winter Soldier and most recently, Cap's replacement when he was assassinated. Barnes' left arm is a cybernetic prosthetic with superhuman strength and enhanced reaction time. The arm can function when not in contact with Barnes and can discharge bolts of electrical energy from its palm. The arm can discharge an EMP causing electronics to either shutdown or become useless. The use of Barnes' EMP is shown when Barnes uses it to shutdown a Nick Fury LMD and when he attempts to use it on Iron Man. The arm has a holographic function to disguise it as a flesh and blood arm. After Steve Rogers is assassinated in the aftermath of Marvel's Civil War, Tony Stark tells Winter Soldier (Bucky) that Steve Rogers had left Stark a letter asking Stark to watch over Barnes and that the mantle of Captain America should continue. Stark suggests that Barnes become the new Captain America. Barnes agrees to becom