David Thewlis, known to a younger generation as Harry Potter character Remus Lupin, will appear in a recurring role in the FX series.

The British actor joins the likes of Ewan McGregor (twice), Carrie Coon (The Leftovers) and Mary Elizabeth Winstead (10 Cloverfield Lane) as a series regular; he'll be playing a mysterious loner who has bad news for Emmit Stussy, one-half of the sibling duo McGregor will play.

Australian actor Scoot McNairy will also add showrunner Noah Hawley's series to his extensive list of film credits which include Monsters, Killing Them Softly, Argo, 12 Years a Slave, Frank, Gone Girl and Batman v Superman.

JK Rowling's hidden Harry Potter sketches Show all 7 1 /7 JK Rowling's hidden Harry Potter sketches JK Rowling's hidden Harry Potter sketches Harry and the Dursleys, by J.K. Rowling JK Rowling's hidden Harry Potter sketches Quidditch, by JK Rowling JK Rowling's hidden Harry Potter sketches Peeves, by JK Rowling JK Rowling's hidden Harry Potter sketches Snape, by JK Rowling JK Rowling's hidden Harry Potter sketches Outside Privet Drive, by J.K. Rowling JK Rowling's hidden Harry Potter sketches MIrror of Erised, by J.K. Rowling JK Rowling's hidden Harry Potter sketches The Weasleys, by J.K. Rowling

Thewlis' other credits include James and the Giant Peach, The Big Lebowski, Kingdom of Heaven and Macbeth. He played Lupin in a total of five Harry Potter films.