Vision is a major character in the Marvel Cinematic Universe. He was a synthesized android that was created by Iron Man, Thor, the Hulk, and Dr. Helen Cho and was originally meant to be Ultron's perfect form. Upon his creation, Vision decided to help the Avengers battle against Ultron during the battle of Sokovia, where the rogue android and his sentries were destroyed. The Vision then became a member of the Avengers, and later participated during the team's clash when Captain America and his allies refused to sign the Sokovia Accords. After the clash, Vision decided to leave the Avengers to begin a romantic relationship with Scarlet Witch. When Thanos wanted the mind stone from Vision's head, the android was killed by the mad titan, who succeeded in wiping out half of the universe.
He was avenged by Scarlet Witch and his allies when the Avengers defeated Thanos in 2023 after managing to bring back the life the Mad Titan had wiped out. Afterwards, it was revealed that the remains of his body fell at the hands of S.W.O.R.D., and later he was reassembled, reactivated with some of Scarlet Witch's chaos magic, and reprogramed to be the organization's sentient weapon. Meanwhile, Scarlet Witch had managed to recreate Vision using a piece of the Mind Stone that she has inside her along with her chaos magic, and created the Hex around a town named Westview to start a family with him, while keeping the civilians of the town hostage via enthrallment.
He is portrayed by Paul Bettany through motion-capture, who also voiced J.A.R.V.I.S. throughout the Iron Man trilogy, as well as in The Avengers and Avengers: Age of Ultron.