Secret Service is a British espionage television series commissioned by ITVX and premiered on 27 April 2026 on ITV1 and ITVX. It is an adaptation of the novel of the same name by Tom Bradby.

Premise When an MI6 intelligence agent uncovers a Russian plot to infiltrate the British Cabinet before a leadership election, senior SIS officer Kate Henderson leads the investigation. When the Prime Minister announces his sudden resignation, the Home Secretary Imogen Conrad and the Foreign Secretary Ryan Walker emerge as the contenders to succeed him.

Kate and her team find deep financial and compromising links between both political factions to Russia. Amid political backstabbing, leaked videos, and the killing of her colleague Rav, Kate races to expose a high-level conspiracy within the government before one of the candidates becomes PM.

Cast Gemma Arterton as Kate Henderson, an MI6 officer and head of the Russia Desk Rafe Spall as Stuart Henderson, Kate's husband and a special adviser to Conrad Alexander Terentyev as Sergei Malinski, an SVR operative, old friend and informant of Kate, codename "Cyclops" Roger Allam as Sir Alan Brabazon, the Chief of MI6, codename "C" Avi Nash as Ravindra "Rav" Sangvhi, an MI6 Russia Desk officer working for Kate Mark Stanley as the Rt Hon Ryan Walker MP, the Foreign Secretary aligned with the centre-right wing of the Labour Party Alex Kingston as Rose Trewen, the Head of Security for MI6 Amaka Okafor as the Rt Hon Imogen Conrad MP, the Home Secretary aligned with the left wing of the Labour Party Khalid Abdalla as Zak Hussein, the Deputy Chief of MI6 and Kate's superior Aoife Hinds as Julie Price, an MI6 Russia Desk officer working for Kate Rochenda Sandall as Melissa Morris, a special adviser to Walker Lydia Leonard as Amanda Walker, an auctioneer and Ryan's wife Steven Elder as the Rt Hon Anthony Fletcher MP, the Prime Minister and Leader of the Labour Party Alma Prelec as Lena Savic, an MI6 asset and nanny employed by Mikhail Borodin, codename "Echo" Galaxie Clear as Fiona Henderson, Kate and Stuart's teenage daughter Harley Barton as Gus Henderson, Kate and Stuart's son Juris Zagars as Lev Amatov, a British–Russian oligarch and political donor Michael Tcherepashenets as Mikhail Borodin, Igor's son and Lena's employer Petar Zekavica Miglen Mirtchev as Igor Borodin, the Director of the SVR Samuel Anderson as Harry Conrad, husband of Imogen Conrad Ben Lloyd-Hughes as Joshua Long Ed Balls as himself (cameo role) Susanna Reid as herself (cameo role) Robert Peston as himself (cameo role) Oleg Levin as Kyril Markov

Episodes

Production The five-part series was commissioned by ITVX in May 2024, with Tom Bradby and Jemma Kennedy adapting Bradby's novel of the same name. Executive producers include Gail Egan and Andrea Calderwood. The series is produced by Potboiler Productions in association with All3Media International. Stan acquired rights in Australia in February 2025. James Marsh is director on the first three episodes, with Farren Blackburn directing episodes four and five. The cast is led by Gemma Arterton, and includes Rafe Spall, Mark Stanley, Alex Kingston, Amaka Okafor, Khalid Abdalla, Avi Nash and Roger Allam.

Filming began in late March 2025 with filming locations including Malta and London.

Broadcast The series premiered on 27 April 2026 on ITV1 and ITVX. ITV presenters Ed Balls and Susanna Reid make cameo appearances as themselves in episode two of the series.

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