Doomsday in Zack Snyder's Batman v Superman has been confirmed. Voice and Motion Capture actor Robin Atkin Downes plays the mythological Kryptonian bogeyman in Dawn of Justice. In all likelihood Doomsday will probably be a VFX creation requiring several individuals to bring him to life; similar to how Andre Tricoteux provided the motion capture for Colossus on Deadpool while Stefan Kapicic provided the voice. Given Downes' prior work history, it's currently unclear whether Downes provided the voice, motion capture or both.
Michael Shannon previously disclosed that he returned to film scenes as General Zod's cadaver, however, it's currently unknown how much Shannon's contribution to the film factors into Zod's presumable transformation into Doomsday. Will the raging beast speak and have intelligence? Or will he just roar?
"Following his titanic struggle against General Zod, Metropolis has been razed to the ground and Superman is the most controversial figure in the world. While for many he is still an emblem of hope, a growing number of people consider him a threat to humanity, seeking justice for the chaos he has brought to Earth.
As far as Bruce Wayne is concerned, Superman is clearly a danger to society. He fears for the future of the world with such a reckless power left ungoverned, and so he dons his mask and cape to right Superman’s wrongs. The rivalry between them is furious, fueled by bitterness and vengeance, and nothing can dissuade them from waging this war. However, a dark new threat arises in the form of a third man: one who has a power greater than either of them to endanger the world and cause total destruction.
The superhero stand-off that the world has been waiting for is finally arriving in cinemas, with an all-star cast bringing to life the characters we all love. Zack Snyder (300) returns as director following the huge success of 2013’s Man of Steel, along with Henry Cavill (The Man from U.N.C.L.E.) in the role of Superman. Also starring Ben Affleck (Gone Girl) as Batman, Amy Adams (American Hustle) as Lois Lane, and Gal Gadot (Fast & Furious 7) as Wonder Woman, Batman v Superman: Dawn of Justice is an explosive, action-packed blockbuster that is sure to thrill DC fans everywhere.”