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By Andrew Smith

Narrated by: William Russell, Carole Ann Ford, Various

Unabridged — 2 hours, 27 minutes

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Overview

The Doctor, Susan, Ian and Barbara land on the planet Hydra, where Admiral Jonas Kaan leads a vast flotilla of ships trying to elude the vicious race that has invaded and occupied their world. But his ships are being picked off one by one, vessels and crews dragged underwater by an unseen foe.

The time travelers find themselves pitched into battle against the Voord, the ruthless enemy they last encountered on the planet Marinus.

As they take the fight to the very heart of the territory now ...