"Avengers: Infinity War" will feature "Fargo" alum Carrie Coon.
"It's true! My voice and a dazzle of gifted animators have teamed up to play Proxima Midnight," Coon wrote.
"To be fair, my face is in there somewhere. #MoCapWhilePregnant #AvengersInfinityWar," she jokingly added.
"Avengers: Infinity War" directors Anthony and Joe Russo had shared the news in an interview with Radio Times.
In the Marvel comics, Proxima Midnight is a member of the Black Order, a team of aliens who work for the titan Thanos. Josh Brolin will portray Thanos in the new movie.
"Avengers: Infinity War" opens in theaters April 27.
Coon played Gloria Bungle in "Fargo" Season 3 and Nora Durst on "The Leftovers."
She will star in the films "Kin" with James Franco and Dennis Quaid and "Widows" with Viola Davis and Elizabeth Debicki.