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  • Michelle Trachtenberg in “Gossip Girl.” Buffy’s little sister will play Georgina Sparks, a troublemaker from Serena’s past.
  • Robin Williams in the 200th episode of “Law & Order: Special Victims Unit.” Williams plays an “engineer whose life has gone terribly wrong” and faces serious repercussions.
  • Warren Buffett, in “All My Children.”  The world’s richest man plays himself in a fictional insider-trading scandal. Buffett appeared on the ABC soap once before, in 1992.
  • Christian Slater in a untitled NBC series from writer-producer Jason Smilovic (“The Bionic Woman).” The series is described as “The Bourne Identity” meets “Jekyll & Hyde” and centers on a mild-mannered suburban dad (Slater) who learns that his alter ego is a spy.