The Vision will be played by Paul Bettany in the film. Though he hasn't appeared in the flesh, Bettany has been a longstanding staple of the Marvel Cinematic Universe, voicing Tony Stark's A.I. J.A.R.V.I.S in all three "Iron Man" films and the first "Avengers." In the comics, the Vision is created by Ultron but later becomes a member of the Avengers.
"Avengers: Age of Ultron" opens on May 1.