The actress played Margaery Tyrell in the HBO fantasy epic, and quickly became Cersei Lannister’s (played by Lena Headey) biggest rival.
After a brief marriage between Margaery and the new king of Westeros Tommen Lannister (Dean-Charles Chapman), Cersei took her revenge by orchestrating a wildfire explosion which killed Margaery and all her other enemies.
In a panel at the London Film and Comic Con this weekend, the 35-year-old shared with the audience the special circumstances which led showrunners Dan Weiss and David Benioff to let her in on the secret early, which was a rare occurrence.
“We all have to dedicate, like, six months of our lives to [Game of Thrones] every year. As actors we do get frustrated if we can't do the other jobs we want to do in the other months of the year.
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Unlike a lot of cast I found out a year earlier than normal because it was meant to be like compensation
“So I phoned Dan and David because there was a job that I really wanted to do and they said, ‘No, you can’t do it, we won’t release you from the schedule’ and I was really upset and they said, ‘But don’t worry Natalie, we’re gonna kill you next year’,” she revealed.
Dormer went on to explain: ”So unlike a lot of cast I found out a year earlier than normal because it was meant to be like compensation: ‘You will soon be free so shut up and stop complaining’."
Meanwhile, Kit Harington, who plays Jon Snow, teased the highly-anticipated meeting between his character and that of Daenerys Targaryen (Emilia Clarke), which airs on tonight’s third episode of the series’ seventh season.
Harington, 30, said the meeting “will be a huge pleasure”, even though pictures appear to show the King in the North wary of the queen. The images could also mean the pair will team up against Cersei to take control of Westeros.
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He also revealed what he thought of his co-star on their first meeting in real life, saying: “I was sort of bowled over by this absolutely stunning, petite girl with this wicked sense of humour.
“We became very fast friends quite quickly,” he shared.
Game of Thrones continues on HBO this Sunday in the US and will be simulcast on Sky Atlantic on Monday at 2am. Catch up on seasons one to seven on NOW TV.