'Downton Abbey' Actor Allen Leech Joins
Ferdaus Shamim/WireImage

Keira Knightley also stars

Allen Leech is set to co-star with Benedict Cumberbatch and Keira Knightley in biopic “The Imitation Game.”

Pic is being helmed by “Headhunters” director Morten Tyldum with Teddy Schwarzman’s Black Bear Pictures financing.

Script topped the 2011 Black List and is based on the life story of mathematician Alan Turing, the genius responsible for cracking the German “Enigma Code” during World War II that helped the Allies stave off defeat, and who would later be prosecuted by Britain in the early 1950s for being a homosexual.

Leech will play a Scottish spy for the Soviets who plots against Cumberbatch’s character.

Schwarzman will produce with Nora Grossman and Ido Ostrowsky of Ampersand Pictures.

Leech can be seen in the upcoming season of “Downton Abbey,” which bows this January. He is repped by ICM Partners and Troika in the U.K.

Filed Under:

Follow @Variety on Twitter for breaking news, reviews and more