Equilibrium (audio story)

 was the one hundred and ninety-sixth story in Big Finish's monthly range. It was written by Matt Fitton and featured Peter Davison as the Fifth Doctor, Sarah Sutton as Nyssa, Janet Fielding as Tegan Jovanka and Mark Strickson as Turlough.

It continued a trilogy of the Fifth Doctor's return to E-Space that began in the previous story, Mistfall.

Publisher's summary
Still looking for a way out of E-Space, the TARDIS crashes to Isenfel - a realm of snow and ice. Snarling beasts stalk the frozen plains, a feisty princess leads the hunt, and a queen in an ice palace rules over her loyal subjects.

But this is no fairytale kingdom, and everyone in Isenfel knows the price of survival. While Nyssa and Tegan uncover deadly secrets hidden in the palace, Turlough flees for his life across the tundra.

And as for the Doctor... he only ever wants to change things for the better. But in a world such as Isenfel, such a hope may not even be possible.

Plot
to be added

Cast

 * The Doctor - Peter Davison
 * Tegan - Janet Fielding
 * Nyssa - Sarah Sutton
 * Turlough - Mark Strickson
 * Karlina - Annette Badland
 * Balancer Skaarsgard/Viktor Skaarsgard - Nickolas Grace
 * Inger - Joanna Kirkland
 * Jesper - John Albasiny
 * Romy - Ella Kenion

Continuity

 * Tegan refers to the fact that Pik Solus stole the interface stabiliser on Alzarius. (AUDIO: Mistfall)
 * After Pik Solus crashed his planet hopper on Isenfel, Balancer Skaarsgard killed him to maintain equilibrium. (AUDIO: Mistfall)
 * Nyssa refers to Adric's death. (TV: Earthshock)