Nikolaj Coster-Waldau has been cast opposite Jessica Chastain in Mama, the horror film that Guillermo del Toro is producing for Universal. Coster-Waldau, who currently plays Jamie Lannister on HBO’s Game of Thrones and is in Toronto for his film Headhunters, will play twins — a father and uncle to a pair of young girls who are haunted by a ghostly woman that could be their mother. Chastain already had been cast as the female lead of the movie, which is based on a 2008 short film by Spain’s Andres Muschietti, who is also directing the feature. Coster Waldau is repped by WME and Impression Entertainment.