The acclaimed forensic drama Silent Witness continues its landmark twenty-ninth season on BBC One and BBC iPlayer, introducing a compelling new case titled The Enemy Within. This gripping two-part storyline unfolds across episodes three and four, airing on Monday, February 9 and Tuesday, February 10, 2026. The series has undergone a significant shift this season, relocating the familiar team from London to Birmingham, setting the stage for some of their most challenging investigations yet.
Returning Core Cast and Series Evolution
The new ten-part series welcomes back the beloved central characters that fans have followed for years. Emilia Fox reprises her iconic role as Dr. Nikki Alexander, leading the forensic team with her trademark expertise. She is joined once again by David Caves as Jack Hodgson, Maggie Steed as Professor Harriet Cunningham, and Fran Mills returning as Kit. The relocation to Birmingham provides a fresh backdrop, injecting new dynamics into the series while maintaining the show's core investigative intensity.
Star-Studded Guest Cast for The Enemy Within
As is tradition with Silent Witness, the second case of the season features an impressive roster of guest talent, bringing depth and intrigue to The Enemy Within narrative.
Phaldut Sharma as Hamza Ahmed
Phaldut Sharma, widely recognised for his long-running role as AJ Ahmed in the BBC soap opera EastEnders, takes on the character of Hamza Ahmed. Sharma's extensive television career includes memorable performances as Achmed in Gavin & Stacey and DCI Ram Sidhu in the critically acclaimed series Unforgotten. His portfolio also features roles in dramas such as Full Circle, Sherwood, and the action series Hanna.
Selin Hizli as DI Kayla Baran
Portraying Detective Inspector Kayla Baran is Selin Hizli, an actress familiar to audiences for her role as Connie Carter in Land Girls and Margaret in Grantchester. More recently, Hizli delivered standout performances as Jen in the comedy-drama Am I Being Unreasonable? and Dr. Sophia Hernandez in the medical thriller Malpractice. Her diverse television work also includes appearances in Things You Should Have Done, Six Four, and the perennial favourite Call the Midwife.
Chris Reilly as Chris
Chris Reilly, known to viewers for his role as Nicky Duffy in the hit Apple TV+ espionage series Slow Horses, appears in The Enemy Within as a character named Chris. Reilly's acting credentials extend to other notable productions including The Head, The Last Post, Devils, and the Guy Ritchie film Wrath of Man.
Gerard Kearns as DC Jonno Magath
Playing Detective Constable Jonno Magath is Gerard Kearns, an actor best known for his portrayal of Ian Gallagher in the groundbreaking Channel 4 series Shameless. Kearns has also featured as Halig in The Last Kingdom, Tommy Marshall in The English Game, and Henry Banks in The Essex Serpent. His film work includes the role of Andy Woodward in the 2022 football drama Floodlights, and he recently appeared as Dan's Dad in Waiting for the Out.
Supporting Guest Roles
The guest ensemble is further strengthened by George Somner, who plays Gary. Somner is recognised for his role as Joe in the Netflix phenomenon Sex Education and as Gary in the BBC comedy Henpocalypse!, alongside playing Bronson in Bad Move. His other credits include This Is Going to Hurt, Gangs of London, Brassic, and the blockbuster film The Hunger Games: The Ballad of Songbirds & Snakes.
Additionally, Tom McCall takes on the role of Steve. McCall's television appearances span series such as Ludwig, This Town, Doctors, White House Farm, Call the Midwife, and the dyst anthology Black Mirror.
Availability and Viewing Details
Silent Witness season twenty-nine, including the complete The Enemy Within case, is currently available for streaming in its entirety on BBC iPlayer. The series continues to deliver its signature blend of forensic science, complex character drama, and suspenseful storytelling, now from its new base in Birmingham, promising viewers another compelling chapter in its long-running history.
