Still under the malign influence of the Black Guardian, Turlough sabotages the TARDIS, placing the Doctor and his companions in grave danger. Nyssa disappears through an unstable interface with a nearby space liner, and the Doctor begins a desperate search for her aboard the ship.

When the liner docks at Terminus, a space station at the exact centre of the universe, the horrific truth starts to emerge. It may already be too late to save Nyssa’s life, and the existence of the entire cosmos is now at peril…

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