The 29-year-old Philadelphia native starred in Ryan Murphy’s Netflix series The Politician and Hollywood, as an aspiring actor, and more recently played a theatre owner who gets mixed up with Mia Goth’s aspiring actress in Ti West’s Pearl.
Brosnahan is the more well-known of the two having recently concluded her run leading The Marvelous Mrs. Maisel for five seasons. Her portrayal of Midge Maisel earned her an Emmy and two Golden Globe awards.
Emma Mackey and Phoebe Dynevor were among the actors reportedly also testing for the Lois Lane role.
Gunn was hired alongside veteran producer Peter Safran last year to help revamp Warner Bros.’ DC strategy.
Their ambitious 10-year plan kicks off with Superman: Legacy, which Gunn said deals with the superhero’s journey to make sense of both his aristocratic Kryptonian heritage and his small town, midwestern upbringing as Clark Kent.