Robocop actor Peter Weller is joining the cast of director J.J. Abrams\' big-screen Star Trek sequel. An APA talent agency spokesman for Weller said on Monday that the actor\'s role is a principal one in the film, but details were being kept under wraps. Weller\'s sci-fi credentials include the Robocop films and the TV series Odyssey 5. He has guest-starred on shows including Dexter, Fringe and Psych. His directing credits include Monk and the TV movie Elmore Leonard\'s Gold Coast. The second Star Trek film will include the return of stars Chris Pine and Zachary Quinto. The film is set for a May 2013 premiere.