Captain America: The Winter Soldier
In Captain America: The Winter Soldier Hydra has shown Steve and his loyal squad that they have infiltrated S.H.I.E.L.D. Before doing so, they use a secret weapon, in the form of a super soldier with a metal arm, in multiple attempts to assassinate Nick Fury. In their attempt to take down Hydra once and for all, Captain America gets in a fight with this metal-armed super soldier and discovers something he never saw coming. In the middle of this fight, he discovers that he is in fact fighting his childhood best friend, Bucky Barnes. Hydra has brainwashed Bucky to where he would focus only on the mission, they had given him until he accomplished it. In the final fight scene, Steve tries to coax his best friend he has always known out of the brainwashed super soldier. He becomes so desperate that he decides not to continue fighting him even though Bucky’s mission was to kill Steve. Bucky continues to beat him to a pulp but, in the end, he decided not...