Dormer will play Cressida, a defector from the abusive overlords in the Capitol, and joins a cast that will include returning stars Jennifer Lawrence, Josh Hutcherson and Liam Hemsworth.
Suzanne Collins novel, which is being broken into two parts with the first bowing Nov. 21, 2014.
Dormer can still be seen on "Game of Thrones," which is currently filming its fourth season. She is repped by Untitled Entertainment, UTA and United Agents.
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