<Li> Allison Williams as Marianne </Li> <Li> Morfydd Clark as Debbie Hickman </Li> <P> It was announced in February 2017 that Benedict Cumberbatch would star in and produce a television adaptation of Edward St Aubyn's Patrick Melrose book series that would air on Showtime in the United States and Sky Atlantic in the United Kingdom . David Nicholls wrote the five episodes of the series, with Edward Berger directing . In July, Jennifer Jason Leigh and Hugo Weaving joined as Patrick's mother and father, and Anna Madeley was cast as Patrick's wife . Allison Williams and Blythe Danner joined in August 2017, with filming having begun by October in Glasgow . </P> <P> The first trailer debuted in April 2018, with the series set to premiere on May 12 on Showtime . The series will consecutively stream new episodes on CraveTV in Canada . It's showing on Sky Atlantic in the UK . </P>

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