Guest Stars Steve Knowles as Gordon Drew Patrick O'Connell as James White Alwyne Taylor as Jo Tandy Michael Bertenshaw as PC Vaughan Paul Nicholson as William Webster Peter McNamara as Terry Cooper Vicky Murdock as Alison Cooper Annie Hayes as Betty Faraday Peter Armitage as Peter Adams Cherith Mellor as Liz Adams Cliff Howells as George Tandy George Sweeney as Ted Faraday Alex Dower as Paul Johnson Jack Carr as Harry Taylor Julie Neubert as Gloria Webster Stella Tanner as Joan Cooper Tony Stephens as Scientific Services Officer George Russo as Billy Faraday