This episode stars Annette Badland (Mrs. Fitzgibbons) and Simon Callow (Duke of Sandringham). Both actors appeared in the Whoniverse (Doctor Who (2005) and The Sarah Jane Adventures (2007) respectively) as a member of the alien Raxacoricofallapatorians. Annette Badland as the human form of Blon in New Who's first season, and Simon Callow as the voice of 'Tree Blatheen' in The Sarah Jane Adventures. He also appeared in Doctor Who as Charles Dickens in two episodes.