Brave New World director reveals how he added Sebastian Stan's Bucky Barnes cameo ahead of the anti-hero's role in Thunderbolts*.

So Bucky Barnes appears and reunites with Sam Wilson in Captain America: Brave New World, but what happens in their one scene together? Bucky arrives to comfort Sam at one of his lowest points in the movie.

In this film, Captain America is hunted by a new villain, only for him to learn that it’s his best friend, Bucky, back from the dead, and brainwashed. Most of the film is Cap trying to figure out why this has occurred, only to learn that the nefarious organization Hydra has its tentacles everywhere.