Regular Cast

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


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.

Written by: Matt Fitton

Directed by: Ken Bentley



coming soon


  • Equilibrum was the 196th Big Finish Release
  • Tegan refers to the fact that Pik Solus stole the interface stabiliseron Alzarius. (Mistfall)
  • After Pik Solus crashed his planet hopperon Isenfel, Balancer Skaarsgard killed him to maintain equilibrium. (Mistfall)
  • Nyssa refers to Adric’s death. (Earthshock)
  • Tegan sarcastically refers to the people of Isenfel as looking like they were having an ABBA tribute night due to their blond hair and blue eyes.
  • Turlough does not know how to ride a bicycle.
  • Borusa always said that The Doctor’s ability to understand logical systems far surpassed his ability to explain them.

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