Captain America: Civil War
Bucky, Steve, and Tony come to the Hydra facility in Siberia, and Tony says he only wants peace. They find all the other Winter Soldiers dead, and realize that Zemo's the one who did it, and he's already there. Zemo tells them that he wanted to destroy the Avengers because they accidentally killed his family in Sokovia, and plays a clip from the 1991 mission. The clip shows that the people in the car from the flashback were Tony's parents, and the Winter Soldier was the one who killed them. Tony attacks Bucky and fights Steve, angry that Steve never told him the truth. Bucky tries to escape but Tony locks him in the Hydra base with Steve. Zemo tries to kill himself but T'Challa, who followed them, stops him and arrests him. After a big fight, Steve defeats Tony and smashes the Arc Reactor in his Iron Man suit, before leaving with Bucky. Tony tells Steve to drop his shield because he doesn't deserve it; Tony and Steve are not friends anymore and the Avengers are broken.