As a follow-up to the casting of Shirley MacLaine, another top American actor is joining the British drama series Downton Abbey. Paul Giamatti will play Cora’s (Elizabeth McGovern) maverick and playboy brother Harold in the Season 4 finale. He joins new cast members Dame Kiri Te Kanawa, Tom Cullen, Julian Ovenden, Nigel Harman, Joanna David and Gary Carr. Season 4 of Downton Abbey premieres on Masterpiece on PBS on January 5, 2014.
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