Michael Sheen is returning as a vampire leader in Summit’s “The Twilight Saga: Breaking Dawn.”The British thesp closed his deal with the studio to reprise his turn as Aro, the leader of the vampire royalty Volturi. Bill Condon is directing “Breaking Dawn,” based on the final tome in the series, in two parts. Book centers on the mortal Bella (Kristen Stewart) marrying the vampire Edward (Robert Pattinson) and Bella giving birth to a half-vampire, half-human daughter. Summit’s splitting the final film in two, with the first set to open Nov. 18, 2011, and the final on Nov. 16, 2012. Wyck Godfrey, Karen Rosenfelt and Meyer are producing, with scribe Melissa Rosenberg adapting each installment. Sheen’s upcoming credits include Disney’s “Tron” and “Beautiful Boy” opposite Maria Bello, Woody Allen’s romantic comedy “Midnight in Paris,” and “Jesus Henry Christ” opposite Toni Collette. He will return to the stage next year starring in “Hamlet,” which will premiere at the Young Vic in London.