'True Blood' star Stephen Moyer to play Capt. Von Trapp Anna Paquin and Stephen Moyer attend the Elton John AIDS Foundation Academy Awards Viewing Party at West Hollywood Park in Los Angeles on February 24, 2013. NEW YORK, Aug. 23 (UPI) -- British actor Stephen Moyer has joined the cast of the live holiday production of "The Sound of Music," NBC announced Friday. The "True Blood" star will portray decorated World War I hero Capt. Georg Von Trapp, the single father of seven children, in "The Sound of Music," the network said. "Living in Austria on the cusp of World War II, the militaristic but warm-hearted Von Trapp engages a young governess, Maria, who he hires to take care of his children," a synopsis said. Carrie Underwood is set to star as Maria in the 3-hour NBC production, which is based on the original 1959 Broadway musical. The program is to air Dec. 5. A 1965 film version of "The Sound of Music" starred Julie Andrews and Christopher Plummer and went on to win five Academy Awards, including Best Picture.