Keri Russell returns as US ambassador Kate Wyler within the third season of The Diplomat, solely this time with some new obligations.
Created by Deborah Cahn, the political thriller picks up within the aftermath of season two, as Grace Penn takes over as president. In the meantime, Kate’s husband Hal is now vp, leaving Kate to scramble between life as an envoy and the second woman.
Rufus Sewell, Allison Janney, David Gyasi, Ali Ahn, Ato Essandoh and Rory Kinnear all return for season three. Newcomers to the forged embrace Bradley Whitfield and Aidan Turner.
All eight episodes of season three have been launched on Netflix on October 16, 2025.
Who finally ends up with Poseidon in The Diplomat season 3 finale?
Within the ultimate episode, US president Grace Penn makes an attempt to persuade UK prime minister Nicol Trowbridge that the Russian submarine submerged 12 miles off the UK’s coast really homes a nuclear weapon known as Poseidon. Nicol is coordinating with China to assist take away the submarine, however as Grace explains, that is successfully handing them a nuclear weapon. As a substitute, she needs the UK prime minister to cooperate with the US in its retrieval.
Nicol leaves the assembly unconvinced that Poseidon really exists. Nonetheless, Kate Wyler convinces her British spy lover Callum, who is aware of the Poseidon is actual, to inform Nicol about his sources, a transfer which might price him his profession. Kate’s husband, vp Hal, nevertheless, refuses to let Kate and Callum go forward with this proposal – which leads them to kind another, far riskier, plan with the president.
To persuade Nicol, Kate suggests to Grace that they need to ship a US submarine to take photos of the Russian submarine to show Poseidon is actual. As Grace explains, with out permission from the prime minister, coming into British territorial waters may very well be seen as an act of warfare, so it’s a dangerous proposition. After Kate makes her pitch, she leaves Hal and Grace to ruminate on the concept, earlier than they finally give it the inexperienced mild.
Someday later, Grace presents the images to Nicol, and whereas he’s extra satisfied of Poseidon’s existence, he doesn’t belief the US after they went behind his again to retrieve the knowledge. Nicol refuses to cooperate with the US, however beneath Hal’s encouragement, Kate intervenes and tells Nicol that no nation – whether or not China, the UK, US, or Russia – ought to have Poseidon, so he ought to bury it beneath the ocean. Nicol, trusting Kate, agrees.
Whereas it seems as if every little thing has been settled, Callum informs Kate that Russia has seemingly already stolen the Poseidon. Kate rapidly informs her husband, however a chat with Grace’s husband Todd, in regards to the shut relationship between Hal and Grace of late that he’s grow to be envious of, makes Kate realise what’s really taking place. Russia hasn’t stolen the weapon in any respect, it was really the US, in a secret plan concocted by Hal and Grace behind closed doorways.
Kate confronts Hal about her suspicions. “You used me to promote a deceive the prime minister,” she remarks. “When the Brits discover out, they are going to take into account this an act of warfare. So will the Russians.”
After Hal calls for Kate keep quiet in regards to the plot, he joins Grace for a photograph alternative on the steps. Within the ultimate scene, we see Hal comment to Grace about an issue; particularly that Kate is aware of about their secret. The episode ends on an unsettling word with a possible warfare on the horizon, and with Kate not figuring out who she will belief.
Will The Diplomat return for a season 4?
The Netflix present was renewed for a fourth season again in Might. No launch date has been introduced, however primarily based on the rollout of prior seasons, it’ll probably arrive in 2026.
