‘The Diplomat’ Ups Allison Janney, Bradley Whitford to Series Regulars for Season 4

Published: Sep 27 2025

The new power couple gracing the screen in *The Diplomat* is set to make a lasting impression. Netflix has elevated Allison Janney and Bradley Whitford to series regulars for the show's highly anticipated fourth season. While the two Emmy-winning actors are initially billed as guest stars in the upcoming third season, which is slated to premiere on October 16, their expanded roles signal a deeper commitment to the series' evolving narrative. Production for season four is scheduled to commence this fall, positioning the show for a potential return in 2026.

‘The Diplomat’ Ups Allison Janney, Bradley Whitford to Series Regulars for Season 4 1

Janney made her debut on *The Diplomat* in its second season, stepping into the role of Vice President Grace Penn—a character poised for a dramatic ascent. In a jaw-dropping twist (spoiler alert), Grace inherits the presidency following the sudden death of President William Rayburn (played by Michael McKean) in the season’s climactic moments. Meanwhile, Whitford portrays Grace’s husband, Todd Penn, whose dynamic with Ambassador Kate Wyler (Keri Russell) evolves into what the show’s logline describes as an “unnerving bond” in the upcoming season.

Whitford’s casting not only reunites him with Janney but also marks a *West Wing* reunion for series creator Debora Cahn, who previously served as a writer and producer on the beloved NBC political drama. “Watching Allison and Brad work together again, and seeing the electric chemistry between them, Keri, and Rufus [Sewell]… it’s like unwrapping a gift you never expected,” Cahn shared in a statement. “Our expectations were sky-high, and they shattered them.”

Here’s a tantalizing glimpse at what’s in store for season three of *The Diplomat*: “Kate confronts the nightmare of achieving her ambitions. She’s just accused Vice President Grace Penn of orchestrating a terrorist plot and openly declared her bid for the VP role. But now the president is dead, Kate’s husband Hal (Sewell) may have accidentally caused his demise, and Grace Penn reigns as leader of the free world. None of this halts Hal’s relentless campaign to secure the vice presidency for Kate. As she steps into a role she never desired, Kate grapples with unexpected freedom, a growing friendship with U.K. Foreign Secretary Austin Dennison (David Gyasi), and an unsettling connection with First Gentleman Todd Penn.”

The series is executive produced by Cahn alongside Janice Williams, Russell, Alex Graves, Peter Noah, and Eli Attie, ensuring a blend of political intrigue and personal drama that keeps audiences on the edge of their seats.

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