Gunpowder Milkshake has added two more big name actors to its roster. Game of Thrones star Lena Headey and Star Trek: Discovery's Michelle Yeoh are the latest to join the impressive cast.

Headey and Yeoh join Karen Gillan, Angela Bassett and Paul Giamatti. While details on the project are being kept under wraps, the assassin thriller reportedly focuses on a mother-daughter assassin duo played by Gillan and Headey. Yeoh is set to play a part of a "sisterhood of secret arms dealers" that will team up to assist Gillan's character once things go wrong.

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Headey, of course, is coming off the final season of Game of Thrones, while this marks the latest project on Yeoh's ever-growing list. Along with currently starring in CBS All Access' Star Trek: Discovery, Yeoh is also set to headline her own Star Trek series as well star in the recently-delayed Avatar sequels.

Gunpowder Milkshake hails from Studiocanal and The Picture Company, with Andrew Rona and Alex Heineman producing alongside Aharon Keshales.

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Directed by Aharon Keshales and Navot Papushado (Big Bad Wolves) from a script by Keshales, Papushado and Ehud Lavski, Gunpowder Milkshake is slated to begin filming on June 3 in Berlin. As of this writing, the film does not yet have a release date.

via The Hollywood Reporter