Deimos, moon of Mars - where Lord Slaadek's plans to revive the ancient Ice Warrior civilisation hang by a thread. Only the Doctor can stop him… but an old enemy, hiding in the catacombs, has an alternative plan. A plan that will test the Doctor's heroism to its limits. Just how far will the Doctor go to prevent the destruction and resurrection of Mars - on a day when his friends become enemies, and his enemies have right on their side?

Written by Jonathon Morris and directed by Barnaby Edwards.

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