•
Mark Strong as Max Easton; former Field Agent,
MI6. (Series 1) •
Walton Goggins as Nathan Miller; an ex-CIA operative. (Series 2) •
Joe Dempsie as Harry Clarke; Field Agent, MI6. Max Easton's son. •
Karima Adebibe as Leyla Toumi; Field Agent, MI6. •
Anastasia Griffith as Amanda Jones;
CIA. •
Alistair Petrie as George White; Head of Section, MI6. •
Lyne Renee as Anna Easton; Max's wife. (Series 1) •
Victoria Hamilton as Meaghan Sullivan; Senator working on the US Intelligence Committee. (Series 2) •
Rachel Shelley as Elliot Taylor; deputy Head of Section, MI6.
Supporting Series 1 (2018) • Adrien Jolivet as Noah; Anna Easton's brother. • Cara Bossom as Chloë Easton; Max and Anna's elder daughter. •
Indica Watson as Lola Easton; Max and Anna's younger daughter. •
Alexandre Willaume as Laurence •
Mark Holden as John Lynn; CIA handler and Amanda Jones' boss. •
William Hope as Senator Hawes •
Bijan Daneshmand as Ali Ardavan •
Corey Johnson as Burrell • Eric Kofi-Abrefa as Jackson • Donald Sage Mackay as Martin Collins •
Kingsley Ben-Adir as Khalid Walker; Intelligence, MI6. •
Zubin Varla as Alexander Said; Senior Field Agent, MI6. •
Amelia Bullmore as Olivia Clarke; journalist. Harry's mother and Max's ex-wife. • Khalid Laith as Anthony Kahani •
Mel Raido as Ryan Cooper; Field Agent, MI6.
Series 2 (2019) •
Lily Banda as Aïcha Konaté; interpreter. •
Zainab Jah as Aminata Sissoko; Malian Minister for Anti-Corruption. •
Hakeem Kae-Kazim as Joseph Damba; Malian Minister for Transport. •
David Jonsson as Isaac Turner; Field Agent, MI6. •
Alexander Siddig as Issouf Al Moctar •
Adam James as Adam McKay •
Sean Cameron Michael as Colonel John Russell. •
Kae Alexander as Jessica Tamura; assistant to Meaghan Sullivan. •
Mark Holden as John Lynn, former CIA handler. •
Pip Torrens as William Kingsley •
Owen Teale as Hal Weaver • Mitchell Mullen as Senator Todd Wilson •
Ruth Gemmell as Gina Graham; partner of Meaghan Sullivan. •
Shelley Conn as Nicole Miller • Darron Meyer as Edward Andrews ==Episodes==