Guest Stars Daisy Head as Genya Safin Luke Pasqualino as David Kostyk Simon Sears as Ivan Co Starring Sujaya Dasgupta as Zoya Nazyalensky Gareth Turkington as Feliks Mark Springer as Zemeni Ambassador Lucy Griffiths as Luda Luke Kaile as Vanya James Littlewood as Ravkan Hunter Muki Zubis as Tidemaker Steven Hartley as Commander Chalikov James Hillier as Captain Churik