At the end of this Marvel episode, Thanos managed to collect all six Infinity stones.
By tapping his fingers, half of the universe was turned into dust, including Bucky.
While the Avengers 4 will see the survivors find a way to reverse this genocide, Sebastian Stan is not sure if the Winter Soldier will return at all.
Speaking to Collider, he said: "When I shot anything, nobody ever told me what part or part two was."
He continued: "The truth is I do not know if I am [Avengers 4].
"What I was shooting was in part one. And anything that a gun might or may not have been partly or a part of two, and I still do not know.
"There were things we shot, that they could never do, because it was easier to turn around the whole thing.
"So, somehow, you go" Okay, it's cool, but … "But you know it's going to deliver on a level that we probably have not yet digested yet Why is it what they do best?
He continued, "I really can not talk about this scene, but I knew it took them three months to design this scene to have everyone there.
"He looked around and just saw everyone from Samuel L. Jackson to Michael Douglas to Michelle Pfeiffer. Everyone was there."
Consider that the characters played by the three above mentioned actors are still dead after Thanos Snap, this can definitely be a scene right at the end when the genocide is reversed.
Avengers 4 will be released at UK cinemas on April 26, 2019.