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Poster of the film The Diplomat S03

The Diplomat S03

Drama War & Politics English


Amid an international crisis, a US diplomat contends with her high-profile job as ambassador to the UK and her strained marriage to a political star.

Cast:Keri Russell, Rufus Sewell, David Gyasi, Ali Ahn, Rory Kinnear, Ato Essandoh,

All Guild Reviews of "The Diplomat S03"

Image of scene from the film The Diplomat S03

Who Really Stole the Doomsday Weapon Poseidon?

Fox in morning light

Kshitij Rawat | Independent Film, TV Critic, and Writer

Fri, October 17 2025

The Diplomat season 3 on Netflix ramps up the tension with a missing Russian submarine carrying the doomsday-capable Poseidon torpedo and shocking betrayals that could upend global diplomacy. Oh, it could also destroy and Kate and Hal’s already fragile marriage.

It’s fitting that The Diplomat on Netflix ends its third season not with an explosion, but with something quieter, and infinitely more dangerous. A silence loaded with betrayal. For a show built on diplomatic finesse and political tension, The Diplomat season 3 brings its most devastating twist yet: the realisation that even love, loyalty, and diplomacy are just different dialects of manipulation. Let’s dive into The Diplomat season 3 story and ending, explained here, cast, and more.

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