While Keri and Rufus are the main players in the Netflix original series, they are surrounded by a few other familiar faces. David Gyasi (Carnival Row, Hell on the Border, Troy Fall of a City) plays an unexpected ally to Ryler and serves as the British Foreign Secretary under Prime Minister Trowbridge.

The series also stars Ali Ahn (Liberal Arts, Supernatural), Ato Essendoh (The Code, Copper), Rory Kinnear (Penny Dreadful, Bank of Dave), and Nana Mensah (Queen of Glory, New Amsterdam) in prevalent supporting roles.

All episodes of The Diplomat will be available to stream on Netflix on April 20, 2023.