This is part of a series of reviews of Doctor Who in chronological timeline order.

Previous Story: Purgatory 12

Big Finish have done it again, they've made an incredible story. It's a great sci-fi concept that allows for some genuinely interesting questions on morality. I absolutely love the unique spin this brings to the "crash-landed colonists" trope. A moving colony that has to turn their spaceship into a train to permanently stay on the night-time side of the planet.

This is used to great effect to question the morality of killing people out of necessity to survive. Adric is hesitant but accepts it due to it being logical, Romana is against it as she doesn't believe anyone should be allowed to choose who lives and dies and the Doctor is willing to hear both sides out.

The cast are fantastic but I specifically want to say that Jane Asher as the pilot is absolutely incredible. She captures the insanity mixed with dangerous devotion to her duty perfectly. In general though, everything about this story is great. from the sound design to the story.

Next Story: The Planet of Witches