Guest Stars Tobias Menzies as Raymond Sinéad Cusack as Meg Orla Brady as Catherine Sacha Dhawan as Vincent Dan Li as Hatsuto Nigel Whitmey as Lowe Molly Jones as Scarlet Vera Filatova as Svetlana Tom Wlaschiha as Arkady Antonia Thomas as Maddy Ron Donachie as Sturridge Simon Donald as Dr Christianson