'Game of Thrones' at Comic-Con 2012: Diana Rigg and many more in Season 3 cast

When "Game of Thrones" returns for its third season next spring, at least 14 new castmembers will join the series, HBO announced Friday at Comic-Con."I'm going to have to start killing off some of these characters to make room for the new ones," author George R.R. Martin joked at the panel. Dame Diana Rigg in one of the series' most colorful roles, Lady Olenna Tyrell, known as "The Queen of Thorns" for her acid tongue and sharp wit. (Game on, Maggie Smith! If anyone could take down "Downton Abbey's" Dowager Countess, it's Lady Tyrell.)Pics: Who's who in 'Game of Thrones'Another familiar face joining Rigg (best known for her starring role in the 1960s spy-fi series "The Avengers") is Mackenzie Crook as wilding raider Orell. Crook played Gareth in the original version of "The Office" -- his character was the analog to Dwight (Rainn Wilson) -- but is most recognized for his work on "The Pirates...



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