Can You Skip Straight to The Diplomat Season 4?
The Diplomat likes to end a season on a cliffhanger, and the third one ended on its worst. Season four lands on Netflix on Thursday, October 15, all eight episodes at once. If you have not watched since 2025, you have forgotten more than you think. And if you have never watched, start at episode one. It is 22 episodes across three seasons, and the show is built so that every payoff depends on a betrayal you watched happen two seasons earlier. Skip ahead and you get the plot without the sting.
What you need to remember
Season one. Keri Russell plays Kate Wyler, a career diplomat headed for Afghanistan who gets sent to London instead, after an attack on the British carrier HMS Courageous kills 43 sailors. Her husband Hal, played by Rufus Sewell, is a brilliant, meddlesome diplomat who cannot keep his hands off her job. The White House is quietly vetting her to replace the vice president. The season ends with a bomb going off in a Conservative MP's car.
Season two. Hal and Kate's deputy Stuart survive the blast. Their aide Ronnie does not. The trail runs from a Russian mercenary to a former adviser of the British prime minister, and then all the way up to Vice President Grace Penn, played by Allison Janney. Hal calls President Rayburn directly to tell him what Grace has done, Rayburn dies shortly after, and Grace becomes president.
Season three. In the cruellest twist yet, it is Hal, not Kate, who becomes Grace's vice president, after Kate had finally admitted she wanted the job. The Wyler marriage comes apart. Then a Russian submarine carrying a Poseidon torpedo, a weapon The National describes as a "doomsday weapon", turns up off the English coast, and the weapon later disappears. Kate works out that Grace and Hal took it. Hal tells her to keep quiet, then tells Grace that Kate knows. The final image is Kate standing beside Grace's husband Todd, played by Bradley Whitford, watching their spouses together.
The marriage is the show
You can watch The Diplomat for the geopolitics, the carriers and the submarines, or for Kate and Hal shouting at each other in corridors. We are firmly in the corridor camp, and season four's premise backs us up.
Netflix says the new season opens with a catastrophic event that threatens the fragile peace between the US and the UK, while Grace and Hal's attempt to seize Russia's most powerful weapon risks pushing America toward war. And who stands in the way? Kate and Todd, an unlikely alliance of two people trying to stop their own spouses. The nuclear plot drives the season, but what will make it hurt is two marriages turned into opposing camps. Creator Debora Cahn has spent three seasons making policy fights personal, and now she has put husbands and wives on opposite sides of a possible war.
Janney and Whitford are now full series regulars, alongside Nana Mensah as White House chief of staff Billie Appiah. Russell and Sewell have carried this show, but Janney's Grace is the first opponent who can outplay Kate at her own game, and Whitford gives Todd the wounded decency of a man who married into the West Wing.
Which season was best
Season three, and it is not close. That is where the show stopped being a smart workplace thriller and became a tragedy about ambition, and it is the only season Metacritic files under universal acclaim, with a score of 84. Season two is the tightest at six episodes, but season three has the bigger heart and the better ending.
What to watch after
If Russell is your reason, go straight to The Americans. It is her other great marriage-as-espionage drama, and it is darker and better for it. If Janney and Whitford made you nostalgic, The West Wing is where they first worked the White House corridors, as C.J. Cregg and Josh Lyman. And if you want the spy thread without the screwball bickering, Homeland is the bleaker cousin.
Start the rewatch now. Thursday, October 15 gives you just enough time for season three.
