Actress Naomi Watts is guarded about the plot of the "Game of Thrones" prequel, but says it is going to be very exciting. Watts, who was at the Sundance Film Festival for her film "Luce", stayed mum on all things "Game of Thrones", reported variety.com.

"Do you really think I'm going to tell you that? Are you trying to catch me off guard," Watts asked with a laugh. Nevertheless, expressing joy about being a part of it, she said: "It's a fantastic world, isn't it? I think there's so many brilliant elements to that series that make it very exciting, very appealing. I don't want to dig myself into a big hole here... All I want to say is it's very exciting…I'll say that again and again and again - and nothing else."