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'Downton Abbey' (PBS)

World War I (1914-1918)Downton Abbey (tv program)Maggie SmithShirley MacLaine
Returns 9:00 p.m., Sunday, Jan. 6 The war is over -- World War I, at least. But a fun new war is brewing when Lady Cora's mother Martha (Shirley MacLaine) comes to visit. Let's just say she and the Dowager Countess (Maggie Smith) do not always see eye to eye. Meanwhile, romance and babies are...