A Great Darkness is spreading over E-Space. Entropy increases. In search of a last exit to anywhere, the TARDIS arrives on the power-less planet of Apollyon, where the scientist Pallister guards the only way out - a mysterious portal. But the portal needs power to open, and the only power Pallister can draw on is the energy contained within the molecular bonds of all living tissue...The Doctor, Nyssa, Tegan and Turlough soon learn that neither Pallister nor his ally, the space pirate Captain Branarack, will stop at murder to ensure their escape. But they're not the only menace on Apollyon. The Sandmen are coming - creatures that live on the life force; that live on death. Death is the only way out into N-Space. Death, or sacrifice. But whose death? Whose sacrifice? Brings together the popular 1983 team of the Fifth Doctor and companions Tegan, Nyssa and Turlough. Peter Davison (the Fifth Doctor) has recently been on screens in Death in Paradise, Law & Order UK, and directed an anniversary special for 2013's Doctor Who 50th anniversary celebrations. Also features Robert Duncan (Drop the Dead Donkey). CAST: Peter Davison (The Doctor), Mark Strickson(Turlough), Sarah Sutton (Nyssa), Janet Fielding (Tegan), Catherine Skinner(Cherryanne), Pallister (Robert Duncan), John Voce(Branarack), Alistair MacKenzie (Robots).