NEW YORK - The "Avengers" sequel has its villain. Marvel announced Thursday that James Spader will play Ultron in its "Avengers: Age of Ultron." In the comics, the character is a robot with artificial intelligence. "Age of Ultron" is the sequel to the 2012 box office hit "The Avengers." Disney will release it in May 2015. The film will be directed by Joss Whedon and will star Robert Downey Jr., Mark Ruffalo and Scarlett Johansson.