The cast of "Avengers: Infinity War" just got even bigger: The film's co-directors have revealed that there's going to be at least one more villain assisting Josh Brolin's Thanos in the flick, and she's played by an Emmy-nominated actress.

While speaking with the UK's Radio Times, co-directors Joe and Anthony Russo spoke about the actors playing Thanos's hechmen, known collectively as the Black Order. In addition to confirming the casting of Tom Vaughn-Lawlor (as Ebony Maw) and Terry Notary (as Cull Obsidian), the Russos also dropped a new bit of intel: "Fargo" and "The Leftovers" star Carrie Coon will play the only female member of the Black Order, known as Proxima Midnight.

Coon herself shared the exciting news on Twitter, revealing, "My voice and a dazzle of gifted animators have teamed up to play Proxima Midnight." The star went on to explain that she also completed some motion-capture work -- using mostly her face -- to bring the villainess to life.

According to Radio Times, a mo-cap performance seems like it was definitely necessary to accurately portray Proxima Midnight, who in the comics "is armed with a spear that possesses the power of a time-distorted sun and is coated in an incredibly deadly toxin." Another interesting tidbit from her original Marvel Comics storyline: she's married to another Black Order henchman, Corvus Glaive. That character's casting has yet to be announced, and there's already been lots of speculation about just who could be playing him (Radio Times thinks it may be Peter Dinklage, who's known to be in "Infinity War," but whose character has yet to be revealed).

Coon joins an already insanely-stacked ensemble, led by Chris Evans, Scarlett Johansson, Chris Hemsworth, Robert Downey Jr., Chris Pratt, Chadwick Boseman, and just about every other MCU character you can think of. While Coon's role might seems small by comparison, we already know that her leader, Thanos, is getting the majority of the screen time. That may mean we wind up seeing quite a bit of the actress, too.

Fans will find out very soon: "Avengers: Infinity War" opens on April 27.

[via: Radio Times, Carrie Coon/Twitter]