28 Years Later Cast: Jodie Comer, Taylor-Johnson & Fiennes

The 28 Years Later cast is locked in — and Cillian Murphy’s Jim is definitively not among them. Jodie Comer leads a new ensemble as Isla, with Aaron Taylor-Johnson as her scavenger husband Jamie and Ralph Fiennes as the moral-center doctor Dr. Kelson. Here’s what we know for certain about who’s in the film.

Director: Danny Boyle ·
Release Year: 2025 ·
Lead Stars: Jodie Comer, Aaron Taylor-Johnson, Ralph Fiennes ·
Key Roles: Isla, Jamie, Dr. Kelson ·
Predecessor Films: 28 Days Later (2002), 28 Weeks Later (2007)

The table below maps confirmed roles to their actors and characters, sourced from official announcements and verified production records.

Is Cillian Murphy Going to Be in 28 Years Later?

The question fans asked most often before the film’s release has a definitive answer: no. Cillian Murphy did not appear as an actor in 28 Years Later, despite widespread speculation that he might reprise his iconic role as Jim from the 2002 original.

Reprising Jim Role

Initial rumors in 2024 suggested Murphy would return as Jim, the character who woke from a coma into the zombie-infested Britain in the first film. However, producer Andrew Macdonald confirmed in January 2025 that Murphy would not be appearing (Wikipedia). Murphy is listed as an executive producer on the film, not a cast member.

Absence from 28 Weeks Later

Murphy notably did not appear in 28 Weeks Later (2007) either, making his absence from the franchise consistent. The actor has spoken in interviews about his complicated feelings toward the series, but his decision to step away as an actor while remaining connected as a producer suggests a deliberate choice to support the franchise without directly starring.

Who Plays the Big Zombie in 28 Years Later?

One of the most visually striking elements of 28 Years Later is the performance of Chi Lewis-Parry as Samson, the Alpha infected leader who commands the mutated zombie horde.

Chi Lewis-Parry Profile

Chi Lewis-Parry, known for his physical theatre background and demanding physical roles, was cast in the zombie role that requires extensive prosthetics and movement work. According to production notes, his character serves as the primary antagonist in the film’s climactic sequences (Wikipedia). The Alpha infected are portrayed as more intelligent and coordinated than previous zombies in the series, a development that director Danny Boyle has described as the infected “evolving” after nearly three decades.

Who Is the Irish Guy in 28 Years Later?

Given that Cillian Murphy is Irish and originally played Jim, this question ties directly to the persistent rumors about his return. The confusion stems from fans assuming that any Irish actor in a significant role must be connected to Murphy.

Link to Cillian Murphy

No Irish actor appears in the primary cast of 28 Years Later. Jack O’Connell, who plays cult leader Sir Lord Jimmy Crystal, is English. Ralph Fiennes is English. Jodie Comer is English. Aaron Taylor-Johnson is English. The assumption that an “Irish guy” appears in the film appears to be fan speculation based on wishful thinking about Murphy’s return rather than confirmed casting information.

The speculation persists because Murphy’s original Jim defined the franchise for many viewers, creating a gravitational pull that colors how fans interpret new casting news.

Who Are the Main Cast Members in 28 Years Later?

The confirmed main cast represents a mix of established stars and rising talent, bringing the 28 Years Later story to life under Danny Boyle’s direction.

Jodie Comer as Isla

Jodie Comer, best known for her Emmy-winning role in Killing Eve, plays Isla—Jamie’s wife who is battling a mysterious illness that complicates the couple’s survival journey. Comer was cast in April 2024 alongside Taylor-Johnson and Fiennes (Wikipedia). Her casting represented a significant coup for the production, bringing major star power to the franchise.

Aaron Taylor-Johnson as Jamie

Aaron Taylor-Johnson plays Jamie, a scavenger and Isla’s husband who leads their survival party onto the mainland in search of answers. Taylor-Johnson brings action-star credentials from films like Kick-Ass and Avengers: Age of Ultron to the role. The actor underwent physical transformation for the demanding scavenger role, which requires extensive running and combat sequences.

Ralph Fiennes as Dr. Kelson

Ralph Fiennes stars as Dr. Ian Kelson, a former doctor and survivor who serves as the moral center of the film’s human characters. In interviews, Fiennes described the plot as depicting “Britain 28 years into this terrible plague of infected people who are violent, rabid humans with a few pockets of uninfected communities” (JoBlo interview). Fiennes joined the cast in April 2024, bringing veteran gravitas to the ensemble.

What About Rumored Cast Like Spike and Kid in 28 Years Later?

Several online discussions mentioned “Spike” and various child actors before the film’s premiere. Here’s what we actually know about these rumored roles.

Supporting Roles

Alfie Williams was confirmed as Spike, the 12-year-old son of Jamie and Isla. Williams was cast in May 2024 as part of the principal cast (Wikipedia). The character serves as both a narrative complication—how do parents protect a child in this world?—and an emotional anchor for the adult characters.

Bone Temple Mentions

The sequel 28 Years Later: The Bone Temple, which was filmed back-to-back with the first film and released in January 2026, may feature additional cast members not present in the initial film. Given that Sony greenlit a third film in the trilogy after press screenings of The Bone Temple in December 2025, the extended cast situation remains fluid.

The 28 Years Later cast situation leaves franchise fans at an interesting crossroads. Cillian Murphy’s absence as an actor—despite his executive producer role—represents a clean break from the original that allows the new ensemble to establish their own identities within the universe. Comer and Taylor-Johnson’s box office performance and critical reception suggest the franchise has successfully transitioned to its next phase, with or without Jim’s return.

Related reading: Cast of Sister Act: Full Cast & Where They Are Now · Cast of the Pale Blue Eye – Bale, Melling and Full Roles List

The ensemble boasts Jodie Comer as Isla, Aaron Taylor-Johnson as Jamie, and Ralph Fiennes as Dr. Kelson, with the full cast list offering deeper insights into their characters.

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