The Wylers have never been ones for a quiet season. Netflix’s Emmy- and Golden Globe-nominated political drama The Diplomat returns, with Kate facing yet another crisis as she’s joined by a surprise new face in the cast.
Jodie Whittaker, the Doctor Who and Broadchurch star, was announced as a guest before the season’s release and appeared briefly in the trailer. But who she was playing—and just how her character would shape the drama—has been one of the season’s best-kept secrets.
When we last saw Kate, she had discovered that the U.S. had secretly taken Russia’s most powerful weapon, a decision with potentially devastating consequences at home and abroad. Season 4 picks up in the fallout, as one catastrophic moment threatens the fragile peace Kate brokered between the U.S. and U.K. Meanwhile, Grace Penn and Hal Wyler’s increasingly close alliance puts two already-strained marriages under pressure. Kate and Todd, uneasy allies at best, must find a way to stop them from tipping the balance of power.
Alongside returning stars Keri Russell, Rufus Sewell, Allison Janney, and Bradley Whitford, Whittaker is among the season’s notable additions. Read on to meet the cast and characters of The Diplomat season 4 and find out where you may recognize them from.
Keri Russell as Kate Wyler

Kate is still balancing her role as U.S. ambassador to the U.K. with the increasingly difficult question of whether she can trust her husband, Hal. After discovering his involvement in a dangerous plan with President Grace Penn, she faces a season in which making herself heard might matter more than ever.
Russell is best known for The Americans, as well as Felicity and Cocaine Bear.
Rufus Sewell as Hal Wyler

