Maggie Smith as Violet; Samantha Bond as Lady Rosamund Painswick; Jim Carter as Mr. Carson; Elizabeth McGovern as Cora; Hugh Bonneville as Robert Crawley; Penelope Wilton as Isobel Crawley; Dan Stevens as Matthew Crawley; Michelle Dockery as Lady Mary Crawley; Brendan Coyle as John Bates; Robert Bathurst as Sir Anthony Strallan; Laura Carmichael as Lady Edith Crawley; Joanne Froggatt as Anna; Paul Copley as Mr. Mason; Phyllis Logan as Mrs Hughes; Lesley Nicol as Mrs Patmore
From IMDB: It's Christmas 1919 and the normally happy activities are somewhat overshadowed by Mr. Bates' arrest and upcoming trial. Lady Cora is thrilled to hear from Sybil that she is pregnant but Lord Grantham is still having difficulty accepting his daughter's choice, despite the fact that he gave her his blessing. Lady Rosamund arrives at Downton for the holidays with her maid Marigold Shore. She also has a new beau, Lord Hepworth, a man the Dowager Countess is convinced is just after Rosamund's money.