Louise Brealey and Owen Teale are among the newly announced cast members

A Discovery of Witches (TV series)

A Discovery of Witches is rounding out its coven.

The fantasy television adaptation released a slew of names in its latest round of casting announcements on Monday morning. Producers made the announcement via the series’ Instagram page.

The most recognizable name in the bunch is likely Louise Brealey, who became a fan favorite on BBC’s Sherlock as the lovelorn Molly Hooper. Brealey will take on the role of Gillian Chamberlain, a witch who resents Diana Bishop’s resistance to embracing the Oxford coven.

Owen Teale will portray Peter Knox, a power-hungry witch who threatens Diana when she discovers a long-lost manuscript in Oxford’s Bodleian Library. Teale is trading in one fantasy series for another, having recently portrayed the treasonous Master-at-Arms Alliser Thorne on Game of Thrones.

Credit: Ian Gavan/Getty Images; Alberto E. Rodriguez/Getty Images

For fans of the series, the casting of Marcus Whitmore — vampire Matthew’s adopted son and lab assistant — has been one of the most highly anticipated bits of news. Relative newcomer Edward Bluemel, who will be seen shortly on Ovation’s The Halcyon, will step into the vampire’s shoes.

Author Deborah Harkness recently told EW she’s been hearing Bluemel’s voice in her head as she writes the next book in the best-selling All Souls series. “The person who I have heard creeping more into my attention is the person who’s playing Marcus because I’m spending so much more time with Marcus,” she said. “I hear it with a slightly different inflection than I might have previously and that’s just a lot of fun.

Scottish actor Greg McHugh will portray Hamish Osborne, daemon and loyal confidante of Matthew Clairmont. Aisling Loftus (War and Peace) will take on the role of Sophie Norman, a pregnant daemon who ends up playing a crucial role in the centuries-old intrigue of the All Souls trilogy.

Credit: Penguin Books

Elarica Johnson, who keen Harry Potter fans will recognize from a brief scene at the beginning of Harry Potter and the Half Blood Princess, will step into the shoes of Juliette Durand, a bloodthirsty and murderous vampire from Matthew’s past.

Miriam Shepherd, the prickly vampire and Matthew Clairmont’s lab assistant, will be played by Aiysha Hart (Atlantis).

Malin Buska (Satu Järvinen), Trevor Eve (Gerbert D’Aurillac), Gregg Chillin (Domenico Michele), Dustin Demri-Burns (Sean), David Newman (Stephen), Adam Stevenson (James), Sadie Shimmin (Head of Faculty), and Michael Culkin (Professor Marsh) round out Monday’s casting announcement.

In August, Bad Wolf Television and Sky Original Productions revealed their first major casting news for the series with the announcement that Matthew Goode and Teresa Palmer would portray central characters, Matthew Clairmont and Diana Bishop.

Further casting and U.S. broadcasters details are still to come.

A Discovery of Witches (TV series)
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