The actress, who plays revenge-seeking Arya Stark, teased fans that she has already read the script for the highly-anticipated season, saying bad things get "real".
"I'd start preparing yourselves now," she said.
"Scratch that, nothing will prepare you for this....," she added with an expletive.
Production for the seven-episode season began at the end of July, a little later than usual for HBO's flagship series, delaying its arrival by a few months. It will now arrive in summer instead of spring.
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