Guest Stars Bryony Hannah as Detective Caroline Ridge Will Brown as Checkers Tomi May as George Highsmith Jonathan Aris as Greg Owen Amelia Clarkson as Keves Papadouris John Henshaw as Detective Hough James Cosmo as Director Houseman Michael Elwyn as Dr. Jameson Co Starring Aravind Ravi as Jay Matthew Steer as Loren Rosie Mellor as Young Helen Rosie Mellor as Young Helen's Twin Flora Montgomery as Sylvia Joshua Ben-Tovim as Archie Fraser James as Detective Martin Ryan Harston as Copper Charlie Kayode Akinyemi as Bubble Perm Tristan Sturrock as Alexander the Vampire David Elliot as Young Houseman Callum Sim as Talamasca Agent Adrian Muykanovich as Ducktail Lee Clothworthy as Train Guard Lee Knight as Adjutant Anna Andresen as Nurse Patricia
