Harry Richardson, Ellise Chappell and Tom York join the cast!

Demelza’s brothers, Drake and Sam and Elizabeth’s cousin, Morwenna (pictured above), are set to join the third series of BBC One drama Poldark as filming begins.

The second series of Poldark may have only just started on BBC One on Sunday (which launched with 5.1 million), but Debbie Horsfield‘s adaptation of the Winston Graham novels has returned to Cornwall to film the 18th Century Cornish saga, starring Aidan Turner as Ross Poldark and Eleanor Tomlinson as his wife Demelza.

The nine-part series will see Ross traversing new family, new loves and new battles, as the French revolution casts a great shadow over life in 1794 Cornwall.

Produced by Mammoth Screen, the third series sees Elizabeth’s cousin, Morwenna, (Ellise Chappell – New Blood) finds herself in George Warleggan’s employment as a governess in order to support her sisters and widowed mother. However Morwenna soon discovers that there are things more important in life than one’s sense of duty or place…

As for Demelza’s brothers, Sam (Tom York – Olympus) arrives in his sister’s world determined to follow in his father’s footsteps, by spreading the Methodist word. But how can Sam profess to save strangers when his own brother courts temptation?

Drake (Harry Richardson – Doctor Thorne), is a good-natured free spirit who has many of the qualities of his sister Demelza. He seeks his own place in the world and finds himself unwilling to settle for the limits life seeks to impose, especially concerning his romantic destiny.

Series three also sees the return of Heida Reed, Jack Farthing, Ruby Bentall, Gabriella Wilde, Luke Norris, John Nettles, Beatie Edney and Caroline Blakiston.

Mammoth Screen’s Executive producer Karen Thrussell said: “It’s with real excitement that we introduce three very talented young actors to the world of Poldark – Harry Richardson and Tom York playing Demelza’s brothers Drake and Sam, and Ellise Chappell as Morwenna, Elizabeth’s cousin. All are major players in the next volume of Winston Graham and Debbie Horsfield’s saga!”

Writer and executive producer Debbie Horsfield says: “We’re thrilled to be kicking off series three with a fantastic array of new characters and a story which scales new heights of conflict, feuding, passion and drama. Ross is older but not necessary wiser, and his recklessness sometimes costs him, and his loved ones, dear. We’re in for a rollercoaster ride where the stakes have never been higher.”

Poldark is directed by Josh Agnew (Mr Selfridge, Jekyll and Hyde) and Stephen Woolfenden (Fantastic Beasts and Where To Find Them).

Poldark Series 3 will be filming across Cornwall and Bristol, including the Bottle Yard Studios, over the coming months for transmission in 2017 on BBC One.