Edward Bluemel's turn as a young Hercule Poirot now has company. Ten new cast members have joined Hercule, the six-part BritBox and BBC series that chronicles how Agatha Christie's famous detective became the world's greatest, with filming set to begin in Liverpool this summer.

The latest additions, announced on 4 August, span stage and screen: Henry Ashton, James D'Arcy, Calvin Demba, Phil Dunning, Jack Gleeson, Tamsin Greig, James Nesbitt, Guy Remmers, Rebecca Rittenhouse and Mawaan Rizwan (Deadline). No character assignments for the new arrivals have been confirmed.

Bluemel, previously seen in My Lady Jane, leads the series as Poirot in his earlier years. The show centres on three of Christie's early stories, with Captain Arthur Hastings — Poirot's loyal companion from the original books — also appearing (BBC Media Centre). Deadline first reported the project in April and confirmed Bluemel's casting in June.

Behind the camera, the structure is set. Benji Walters writes the series. Jonny Campbell directs the first two episodes, Chanya Button the middle pair, and Alrick Riley the final two. Charlie Palmer serves as series producer. Mammoth Screen, which previously produced the BBC Christie adaptations And Then There Were None and Murder Is Easy, produces alongside Agatha Christie Limited. Fifth Season handles global distribution.

For audiences, the split is straightforward: Hercule will air on the BBC in the UK and on BritBox in North America, arriving in 2027. The series was officially announced by BritBox on 8 June 2026 (BritBox Press).

Liverpool will serve as the primary filming location, standing in for the story's period settings. Production is scheduled to begin in summer 2026, with further casting still underway as the ensemble fills out (TV Insider).

What makes this stand out is the origin-story angle. Christie wrote Poirot into dozens of novels and stories, but a dedicated prequel — tracing how a Belgian detective built the reputation that made him famous — is new territory for a television adaptation. The six-episode format gives the writers room to draw on three early Christie stories without compressing them into a single film, the approach the BBC has previously taken with standalone Christie novels.

The casting breadth also signals ambition. Tamsin Greig and James Nesbitt bring decades of television credit. Jack Gleeson, known to many as Joffrey Baratheon in Game of Thrones, returns to a period ensemble. Mawaan Rizwan moves from comedy writing and performance into a scripted drama cast. Together they suggest Hercule is building a roster that goes well beyond a single star vehicle.

With filming about to start and more names to come, the pieces are falling into place for a 2027 arrival.