Richard Dormer leads the cast of “The Watch,” an upcoming BBC America series based on stories from Terry Pratchett’s Discworld books. Dormer, who played Beric Dondarrion in “Game of Thrones,” stars as Sam Vimes, the captain of a band of misfit cops known as The Watch.

Jo Eaton-Kent appears as Constable Cheery in the series. Hugill plays idealistic new recruit Constable Carrot and Corlett the mysterious Corporal Angua, who is tasked with Carrot’s training. Rossi is the formidable Lady Sybil Ramkin, last scion of Ankh-Morpork’s nobility, and Adewunmi is the wronged Carcer Dun, who is out to take control of the city.