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In the Marvel Cinematic Universe film Avengers: Age of Ultron, Spader voices Ultron, an artificially intelligent robot who was created by Tony Stark and Bruce Banner to help the Avengers stop threats to humanity. However, Ultron became corrupted and turned against humanity, setting out to destroy all humans. Spader's performance as Ultron was praised by critics, with many noting his ability to convey the character's complexity and menace.