In this hit superhero sequel, a global defense program invented by Tony Stark (Robert Downey, Jr.) leads to the creation of Ultron (James Spader, in a voice and motion-capture performance), a robotic menace bent on destroying humanity. Joined by new recruits Scarlet Witch (Elizabeth Olsen), Quicksilver (Aaron Taylor-Johnson), and Vision (Paul Bettany), can the Avengers foil Ultron's sinister plan?