The Diplomat Season 3 Trailer and Key Art Debut

Netflix has unveiled the official trailer and key art for The Diplomat, which is set to premiere on October 16, 2025. The trailer reveals a world on edge as Kate and Hal Wyler navigate an unprecedented constitutional crisis as Grace Penn officially steps into the Oval Office.

In the eight-episode third season, Ambassador Kate Wyler (Keri Russell) lives the particular nightmare that is getting what you want. She just accused Vice President Grace Penn (Allison Janney) of hatching a terrorist plot and admitted she’s after the VP’s job.

But now the President is dead, Kate’s husband Hal (Rufus Sewell) may have inadvertently killed him, and Grace Penn is the leader of the free world. None of this slows Hal’s campaign to land Kate the vice presidency.

Kate steps into a role she never wanted, with a freedom she never expected, an increasingly complicated friendship with Foreign Secretary Austin Dennison (David Gyasi), and an unnerving bond with First Gentleman Todd Penn (Bradley Whitford).

The Diplomat Season 3 stars Keri Russell, Rufus Sewell, David Gyasi, Ali Ahn, Rory Kinnear, and Ato Essandoh. The additional cast includes Celia Imrie, Michael McKean, Nana Mensah, and Miguel Sandoval. Allison Janney and Bradley Whitford are the guest stars.

Debora Cahn is the creator, showrunner, and executive producer. The executive producers also include Janice Williams, Keri Russell, Alex Graves, Peter Noah, and Eli Attie.