Lena Headey in Game of Thrones

Helen Sloan/HBO

Lena Headey isn't leaving violence and action behind when "Game of Thrones" ends.

The actress has joined the upcoming assassin thriller "Gunpowder Milkshake," Deadline reports. She'll co-star in the film, joining an ensemble cast that also includes Karen Gillan ("Jumanji: Welcome to the Jungle"). The cast is meant to be "multi-generational" and female-driven, according to a THR report in early January.

"Gunpowder Milkshake" will be directed by Aharon Keshales and Navot Papushado, who penned the script with Ehud Lavski. The film comes from Studiocanal and The Picture Company, with Andrew Rona and Alex Heineman serving as producers. Meanwhile, Didier Lupfer, Ron Halpren, and Shana Eddy will executive produce.

Plot details haven't been revealed, so it's unclear whether Headey will be a good guy, a bad guy, or something in between. Thanks to "Game of Thrones," we definitely know she can pull off calculating and merciless, so we'll be interested to see if she does it again, or if she shows a softer side.

Headey stars in the final season of "Game of Thrones," due out in April, as well as the upcoming film "Fighting with My Family." Her previous movie credits include roles in "Pride and Prejudice and Zombies," "300: Rise of an Empire," and "The Purge," among others.

[via: Deadline]