The Diplomat season 4 brings in Jodie Whittaker as Prime Minister and kills the President

Verdict: If you liked the first three seasons, this one doubles down on twists and adds a strong new lead—worth continuing.

Debora Cahn's political thriller The Diplomat just dropped its fourth season on Netflix, and it wastes no time burning down the status quo. President Grace Penn gets shot in the first episode. That's not a spoiler you can dodge—it sets the entire season in motion.

Keri Russell is back as Kate Wyler, U.S. Ambassador to the UK, and Rufus Sewell returns as Hal Wyler, now Vice President. Season 3 left off with Kate learning that Grace Penn and Hal had stolen Russia's Poseidon superweapon, so tensions were already sky-high. Now the show has to deal with the fallout of an assassination attempt and a power vacuum.

Jodie Whittaker steps in

The biggest casting addition is Jodie Whittaker, who plays new Prime Minister Bethan Vaughan. If you watched her as the Thirteenth Doctor in Doctor Who or in Broadchurch, you know she can handle intensity and charm in equal measure. Her character will be navigating a minefield of international crises alongside Kate, and early reports suggest the two have solid chemistry.

Bradley Whitford, who played First Gentleman Todd Penn in earlier seasons, has been bumped up to series regular for Season 4. That means more screen time for his particular brand of sardonic political operator, which the show uses well.

What you're walking into

This is not a show you can jump into cold. If you haven't seen the first three seasons, you'll be lost. The appeal here is watching competent people try to manage catastrophes while also lying to each other about classified operations. It's tense, fast-paced, and leans hard into procedural dialogue. Ali Ahn plays Eidra Park and Ato Essandoh plays Stuart Hayford, both returning as key players in Kate's circle.

The show doesn't slow down to explain itself, which works if you're already invested. If you bounced off earlier seasons because of the pacing or the dense political jargon, this one won't change your mind. But if you've been following Kate's rise and the increasingly messy conspiracy around her, Season 4 delivers more of what made the show compelling in the first place.

It's streaming now on Netflix. No word yet on whether this is the final season, but the way it opens suggests the writers aren't playing it safe.