Margarita Levieva

as Marina Litvinenko

4 episodes

Mark Bonnar

as DSU Clive Timmons

4 episodes

Neil Maskell

as DI Brent Hyatt

4 episodes

Barry Sloane

as DS Jim Dawson

4 episodes

Daniel Ryan

as DAC Peter Clarke

4 episodes

Richard Pepper

as DCI Duncan Ball

4 episodes

Kayla Meikle

as DC Deborah Maxwell

4 episodes

Kirsten Foster

as Jenny Hyatt

4 episodes

Temirlan Blaev

as Young Anatoly Litvinenko

4 episodes

Mark Ivanir

as Alexander Goldfarb

4 episodes

Marcus Onilude

as Aidan

3 episodes

Sam Troughton

as DI Brian Tarpey

3 episodes

Estella Daniels

as Dr. Onome George

3 episodes

Dan Renton Skinner

as James Cairns

3 episodes

Nikolai Tsankov

as Boris Berezovsky

3 episodes

David Tennant

as Alexander Litvinenko

2 episodes

Sarah Naudi

as Dr. Justine Adams

2 episodes

Ian Conningham

as Dr. Nick Gent

2 episodes

Maggie Evans

as Professor Pat Troop

2 episodes

Edward Baker-Duly

as Martin Svensson

2 episodes

Aleksandar Mikic

as Dmitry Kovtun

2 episodes

Radosław Kaim

as Andrey Lugovoy

2 episodes

Greg Kolpakchi

as Oscar Enrique

2 episodes

Richie Lawrie

as Awe (uncredited)

2 episodes

Kimberley Sterling

as ICU Nurse (uncredited)

2 episodes