John Krasinski plays Jack Ryan, who has left the field and is living in New York when James Greer pulls him back to deal with unfinished business with MI6. Krasinski returns to the role from the Prime Video series and also works behind the camera: he wrote the screenplay with Aaron Rabin, shares the story credit with Noah Oppenheim and produces with Allyson Seeger and Andrew Form.
Wendell Pierce plays James Greer, the CIA Deputy Director who asks Jack to clear up unfinished business from a past joint operation with MI6. Pierce returns to the part from the Prime Video series, and Variety's trailer report lists him among the returning players. The plot ties a revived black ops unit called Starling to Greer's past, so his character carries much of the story's history.
Sienna Miller as Emma Marlow
Sienna Miller plays Emma Marlow, the MI6 officer who moves to arrest Jack in Dubai. Miller is new to the franchise, and TVLine reported her casting on December 4, 2024, describing the part as an MI6 agent starring opposite John Krasinski. TheWrap later called Marlow a new character who teams up with Jack and his crew.
Michael Kelly plays Mike November, whom Variety describes as a former CIA station chief who now works as a private security contractor. Jack teams up with November and travels with him to Dubai, where the story's first confrontation takes place. Kelly reprises the role from the Prime Video series, and TheWrap names him as one of the returning faces around Krasinski.
Max Beesley as Liam Crown
Max Beesley plays Liam Crown, the antagonist of Tom Clancy's Jack Ryan: Ghost War. The News on Sunday describes Crown as a cold terrorist with no remorse for Greer and the United States. Deadline reported Beesley's casting on February 12, 2025, in the same announcement as Douglas Hodge, JJ Feild and Betty Gabriel, and it pointed to his recent work in The Gentlemen and Hijack.
Betty Gabriel as Elizabeth Wright
Betty Gabriel plays Elizabeth Wright, the CIA director, a role she first played in seasons three and four of the Prime Video series. Deadline's February 2025 casting report mentioned those earlier seasons, along with her work in Get Out and Manhunt. Variety's trailer coverage confirms that Gabriel is back in the role for the film.
JJ Feild as Andrew Spear
JJ Feild is credited as Andrew Spear and sits seventh in TMDB's billing. Deadline reported his casting on February 12, 2025, together with Max Beesley, Douglas Hodge and Betty Gabriel. The report listed earlier credits including Ford v Ferrari, the Captain America films, The Peripheral and The Romanoffs.
Douglas Hodge as Nigel Cooke
Douglas Hodge plays Nigel Cooke, who confronts Jack in Dubai with frightened, cryptic warnings and is then killed by an assassin. Hodge was part of Deadline's February 2025 casting announcement, which cited his work in Joker, Red Sparrow and The Great. The report also noted that he was set to appear in G20 with Viola Davis.
Dominic Mafham as MI6 Chief Arnold
Dominic Mafham is credited as MI6 Chief Arnold and is ninth in the billing order on TMDB, where he appears among the top billed cast. His character belongs to the British intelligence side of the story. That side matters from the start, because the mission Greer sends Jack to finish began as a joint CIA and MI6 operation.
Alex Brockdorff as Mark Whitaker
Alex Brockdorff plays Mark Whitaker and is tenth in TMDB's billing order. That puts his credit in the top half of a 30 name cast list, above the long run of smaller parts such as the MI6 Strike Team Leader, the Delivery Driver and the three Apartment Residents who appear further down the credits.
Nick Adamson as Trocken
Nick Adamson is credited as Trocken and is eleventh in TMDB's billing order. Trocken is one of several supporting characters credited by a single name, along with Aria, Claudia and Bashir further down the list. Adamson's credit falls between Alex Brockdorff's Mark Whitaker and James Allen's Colonel Jones in the billing.
James Allen as Colonel Jones
James Allen plays Colonel Jones and is twelfth in TMDB's billing. He is one of several military characters in the credits, along with Colonel Lewis (Demetri Goritsas) and a British Army Officer (Brian Bususu). That fits a story built around a joint CIA and MI6 operation and a revived black ops unit.