'The Gilded Age' stars praise Merritt Wever's seamless debut as Monica O'Brien in season 3

Merritt Wever has joined The Gilded Age Season 3 as Monica O’Brien, the sister of Bertha Russell, portrayed by Carrie Coon. Her arrival was featured in Episode 4, following previous mentions of her character since the series premiere.

In the episode, Bertha invites Monica to their home to attend Gladys’s wedding to the Duke of Buckingham, fulfilling a request previously suggested by George Russell, played by Morgan Spector. The addition of Wever’s character expands the Russell family storyline in the HBO series.

Carrie Coon noted to Decider that Wever’s performance was notable, sharing that she felt Wever fit in seamlessly on set and brought a truthful, natural quality to the role.

Coon highlighted how working with actors like Wever contributes to ongoing learning for the cast.

Morgan Spector also shared his experience working with Wever, highlighting the dynamic between George and Monica and how it added depth to the interactions within the family.

Wever’s previous work includes roles in Nurse Jackie, Godless, Unbelievable, Run, and Severance, demonstrating her adaptability across genres.

In addition to Wever’s introduction as Monica O’Brien, The Gilded Age Season 3 Episode 4 also introduced Lady Sarah, played by Hattie Morahan, and a psychic portrayed by Andrea Martin, visited by Ada, played by Cynthia Nixon.

Carrie Coon expressed appreciation for the additions to the cast, describing the season’s expanded ensemble as an “embarrassment of riches” for the production.