PROBE: The Zero Imperative

An ancient evil approaches Earth bent on destruction and murder...but who is assisting it and who will stand in its way?

Former UNIT luminary Liz Shaw and her assistant Bayliss are investigating a series of bizarre murders, all committed near a soon-to-be-closed psychiatric hospital. When the hospital is unexpectedly reprieved by rich Industrialist Peter Russell events seem to move out of Liz's control. Are the incumbent director of the clinic, Doctor Dove and his predecessor Doctor O'Kane harboring the killer? What is the centuries-old horror hidden in the grounds? And what exactly is the secret of room zero?

Cast

Caroline John

Dr. Elizabeth Shaw

Jon Pertwee

Dr. Jeremiah O'Kane

Sylvester McCoy

Dr. Colin Dove

Colin Baker

Peter Russell

Mark Gatiss

Dr. William Bruffin

Louise Jameson

Patricia Haggard

Sophie Aldred

Public Relations Officer

Linda Lusardi

Louise Bayliss

David Terence

Daniel O'Kane / Eustace O'Kane

Nicola Fulljames

Dr. Beatrice Hearst

Patricia Merrick

Dr. Julie Gilchrist

Jonathan Rigby

Cummings