The HBO hit series Game of Thrones has added two new cast members for Season Two, with Carice van Houten and Stephen Dillane signing on.

Both Carice van Houten and Stephen Dillane will play pivotal roles in Season Two. Stephen Dillane will play Stannis Baratheon, brother of the late King Robert, who is vying for the throne. Carice van Houten will play Melisandre, a seductive woman with prophetic powers which she uses to sway people towards her religion. She also advises Stannis in his quest to be king, luring him in to her way of life.

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We reported last week that Gwendoline Christie has been cast as Brienne Tarth (a.k.a. Brienne, the Maid of Tarth), the sole heiress of Lord Selwyn Tarth of Evenfall Hall.

Production is scheduled to start on Game of Thrones Season 2 just after the show makes its debut at this year's San Diego Comic-Con. HBO has not announced yet when the second season will premiere.