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?
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
Alexander Kirk Orderly
Daniel Mills Ghostly Child Voice
Peter Davison Patient One
- Caroline JohnDr. Elizabeth Shaw
- Jon PertweeDr. Jeremiah O'Kane
- Sylvester McCoyDr. Colin Dove
- Colin BakerPeter Russell
- Mark GatissDr. William Bruffin
- Louise JamesonPatricia Haggard
- Sophie AldredPublic Relations Officer
- Linda LusardiLouise Bayliss
- David TerenceDaniel O'Kane / Eustace O'Kane
- Nicola FulljamesDr. Beatrice Hearst
- Patricia MerrickDr. Julie Gilchrist
- Jonathan RigbyCummings
- Alexander KirkOrderly
- Daniel MillsGhostly Child Voice
- Peter DavisonPatient One