How Gwendoline Christie trained for battle scenes in 'The Last Jedi'
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WATCH: The British actress told "GMA" how she trained for her highly-anticipated on-screen battle with John Boyega.

Gwendoline Christie returns to the screen next week in "Star Wars: The Last Jedi" and she revealed today which famous stuntman helped her prepare for the movie's epic battle.

"What I can tell you is that I was reunited with C.C. Smiff -- he was the man who gave me the confidence and the skills and worked with me for months beforehand and taught me to fight and sword fight," Christie said.

Smiff also worked with Christie on "Game of Thrones."

Captain Phasma, Christie's character, and Finn, played by John Boyega, have an intense battle scene in the new movie. Christie gushed that Boyega "has this vital energy that just really inspires everyone around him."

John Boyega, as Finn, in a scene from "Star Wars: The Last Jedi" official trailer.

Despite her packed production schedule with "GOT," Christie said she was "relentless" in trying to land a role in the new "Star Wars" films.

"I'd wanted to be in 'Star Wars' my whole life," she said. "Then when I heard this was coming back, you know, I was cheering on with the rest of the world thinking we're going to have it again and I really wanted to be a part of it and also when I saw how diverse the casting was, that's what excited me."

She added, "I was very lucky to hear that they were interested."

Christie said she was taken by Carrie Fisher in her role as Princess Leia. "She is different. She is unafraid. She's smart. She's brave. She's bold. She's unashamedly herself. She's hilarious. And she doesn't look the same as all those other kinds of representations we're given," she said.

Captain Phasma perfectly suited Christie's expectations for a strong female character, she explained.

"They had decided to create this female character who looked incredible but her femininity is not delineated in the shape of her body," Christe said.

"The Last Jedi" will be in theaters nationwide on Dec. 15.

ABC News and Lucasfilm Ltd. are both part of the Disney Co.