Natalie Dormer will play a supernatural demon in creator John Logan's 'City of Angels.'

Natalie Dormer is ready to get her demon on for Showtime. The Game of Thrones favorite has been tapped to star in the premium cable network's Penny Dreadful revival, City of Angels.

Penny Dreadful: City of Angels, which will feature all new characters and storylines, opens in 1938 Los Angeles, a time and place deeply infused with social and political tension. When a grisly murder shocks the city, Detective Tiago Vega (Daniel Zovatto) is embroiled in an epic story that reflects the rich history of Los Angeles: from the building of the city's first freeways and its deep traditions of Mexican-American folklore, to the dangerous espionage actions of the Third Reich and the rise of radio evangelism. Before long, Tiago and his family are grappling with powerful forces that threaten to tear them apart.

Dormer will topline the series as Magda, a supernatural demon who can take the appearance of anyone she chooses and who manifests in a number of guises throughout the story. The character is a dangerous enemy and invaluable ally. Dormer joins a cast that also includes Jessica Garza (The Purge) and Johnathan Nieves (New Amsterdam).