The Entropy Plague (audio story)

 was the 197th story in Big Finish Productions' monthly range. It concluded a trilogy of the Fifth Doctor's return to E-Space that began in Mistfall.

Publisher's summary
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?

Plot
to be added

Cast

 * The Doctor - Peter Davison
 * Turlough - Mark Strickson
 * Nyssa - Sarah Sutton
 * Tegan - Janet Fielding
 * Cherryanne - Catherine Skinner
 * Pallister - Robert Duncan
 * Branarack - John Voce
 * Robot - Alistair MacKenzie

Uncredited

 * Adric Traken - Alastair Mackenzie

Continuity
to be added