Guest Stars Caroline O'Neill as Win Thursday Abigail Thaw as Dorothea Frazil Sara Vickers as Joan Thursday Simon Harrison as Ronnie Box Richard Riddell as DS Alan Jago Alison Newman as Viv Wall Sophie Winkleman as Isobel Humbolt Benjamin Wainwright as Professor Adam Drake Oliver Chris as Dr Elliot Wingqvist Michael Parkhouse as TV Anchor Sasha Willoughby as Flora Humbolt Blake Ritson as Gabriel Van Horne Terenia Edwards as Marilyn Gidby Katie Faye as Christine Chase Mary Stockley as Hildegard Slayton Sargon Yelda as Dr Larry Humbolt Gabriel Payne as Matthew Humbolt Ross Boatman as Mac Honeydew Charlotte Bradley as Mrs Trellis Robert Hands as Eric Gidby Alice Orr-Ewing as Natalie Wingqvist Matthew Cottle as Jeff Slayton
