British thespian Jonathan Pryce and former child star Keisha Castle-Hughes have joined the cast of Game Of Thrones. The duo is part of nine new additions to the cult TV series announced at Comic-Con in San Diego, California on Friday (25Jul14). They also include Star Trek: Deep Space Nine star Alexander Siddig and Jessica Henwick. Pirates of the Caribbean star Pryce has been cast as High Sparrow, while Whale Rider actress Castle-Hughes will portray Obara Sand, the warrior daughter of late character Prince Oberyn Martell. Siddig will play her uncle, Doran Martell.