Guest Stars Barry Sloane as DS Jim Dawson Daniel Ryan as DAC Peter Clarke Mark Ivanir as Alexander Goldfarb Kayla Meikle as DC Deborah Maxwell Richard Pepper as DCI Duncan Ball Kirsten Foster as Jenny Hyatt Temirlan Blaev as Young Anatoly Litvinenko Estella Daniels as Dr Onome George Sam Troughton as DI Brian Tarpey Marcus Onilude as Aidan Sarah Naudi as Dr Justine Adams Dan Skinner as James Cairns Maggie Evans as Professor Pat Troop Rad Kaim as Andrey Lugovoy Ian Conningham as Dr Nick Gent Aleksandar Mikic as Dmitry Kovtun Edward Baker-Duly as Martin Svennson Kareem Alexander as Michael Antonio Magro as Mario Scaramella Simon Paisley Day as Sir John Scarlett
