Outlander has cast two more key characters for Season 3 of Starz’s hit time-travel saga. Newcomers Hannah James and Tanya Reynolds will play the Dunsany sisters, Geneva and Isobel, respectively.

James’ Geneva, the eldest daughter, is as beautiful as she is headstrong. Yet she’s also petulant, spoiled and demanding of the servants at their home- Helwater. Geneva’s accustomed to getting exactly what she wants when she wants it. Underneath however she has a vulnerability — even a naiveté — due to her sheltered life. Reynolds’ Isobel, Geneva’s younger sister, is warm, friendly and genuine. Though more plain than her sister, Isobel is inherently more likeable and compassionate towards others. In addition to stars Balfe and Heughan, they join new Season 3 cast members César Domboy, Lauren Lyle, Wil Johnson, John Bell and David Berry.

From developer/executive producer Ronald D. Moore and Sony Pictures TV, Season 3 will be based on the third of the eight books in Diana Gabaldon’s Outlander series, entitled Voyager. The third season picks up right after Claire (Caitriona Balfe) travels through the stones to return to her life in 1948. Now pregnant, she struggles with the fallout of her sudden reappearance and its effect on her marriage to her first husband, Frank. Meanwhile, in the 18th century, Jamie (Sam Heughan) suffers from the aftermath of his doomed last stand at the historic battle of Culloden, as well as the loss of Claire.

James, a graduate of the Guildford School of Acting in 2014, can be seen in the role of Emma Green in PBS’ Mercy Street. She’s repped by WME, Luber Roklin Management, and Bloomfields Welch Management in London.

Since graduating from The Oxford School of Drama in 2015, Reynolds has played a lead role in feature Fanny Lye Deliver’d, opposite Maxine Peake and Charles Dance, set to be released next year. She has also just finished filming a lead role in Sky One drama Delicious, opposite Dawn French.

Filming began for the 13-episode Season 3 in August in Scotland and the production will move to South Africa in 2017. Outlander is produced by Tall Ship Productions, Story Mining & Supply Company and Left Bank Pictures in association with Sony Pictures Television.