Series. The BAFTA Award-winning series return for a fourth season, with Hugo Weaving joining the cast. Season 4 opens with a bombing that detonates personal secrets, rocking the already unstable foundations of Slough House. The series recently scored nine Emmy Award nominations for its widely acclaimed third season, including Outstanding Drama Series and acting nominations for Gary Oldman, Jack Lowden and Jonathan Pryce. The returning ensemble cast also includes Kristin Scott Thomas, Saskia Reeves, Rosalind Eleazar and Australian Christopher Chung. Watch the trailer.