Guest Stars Jack Bannon as Sam Thursday Stefanie Martini as Georgina Mortmaigne Hermione Corfield as Cassie Watkins Darrell D'Silva as Geoff Craven Hugh Simon as Professor Kemp David Burnett as Ricky Parker John Draycott as Turnbull Ben Lambert as Guy Mortmaigne Milo Twomey as Dr Hector Lorenz Peter Forbes as Hodges Amy McCallum as Julia Mortmaigne Eleanor Williams as Ingrid Hjort Rob Callender as Philip Hathaway Sam Coulson as Mark Bryden
