Actor Thomas Kretschmann has signed on to portray a major villain in The Avengers sequel Age Of Ultron. James Spader has already signed on to portray the film's main antagonist, Ultron, and the Dracula star will reportedly play terrorist leader Baron Wolfgang von Strucker in the film, according to The Hollywood Reporter. The movie is set for release in 2015 and also features returning Avengers castmates Robert Downey, Jr., Scarlett Johansson, Chris Hemsworth, Mark Ruffalo and Jeremy Renner.