According to Tracy Letts, husband of Proxima Midnight's actress Carrie Coon, the villain didn't return because Marvel wouldn't pay her more money. "They said, ... 'you should feel fortunate to be part of the Marvel Universe'" Letts said in an episode of The Big Picture.

Endgame was due to a salary dispite, her husband Tracy Letts has said.Coon first played villain Proxima Midnight in 2018’s Avengers: Infinity War, in which her character was killed off. However, she was still offered the chance to return for the 2019 sequel,