Summoned by the Winter family's Calling Card, the TARDIS arrives in 15th Century France. In the shadows of a forest the Doctor and Clara encounter a band of soldiers who are protecting a mysterious young woman. Also travelling with the party is self-confessed amateur historian Julius Winter. Young Joan of Arc is troubled by voices telling her things she should not know about - things concerning the Doctor's own people, the Time Lords. When he realises that an element of the Time War is involved, the Doctor is compelled to discover where Joan is getting her information from. But in doing so, he and Clara are drawn into terrible danger...
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Materialising in Outer Space, the TARDIS is attached by a missile fired from the dark side of the moon. Back on Earth, the newly-formed United Nations Intelligence Taskforce (UNIT), led by Brigadier Lethbridge-Stewart, is disturbed by a series of UFO sightings over Southern England. Meanwhile, a large consignment of mysterious crates is delivered to the headquarters of International Electromatics, the largest computer and electronics firm in the world. These three seemingly unconnected events are in fact the preparations for a massive Cyberman invasion of Earth, with one aim: the total annihilation of the human race.
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A mysterious power loss strands the Tardis on Exxilon, a sinister fog-shrouded alien planet. The Doctor meets the survivors of a beleaguered expedition from Earth, while Sarah finds a mysterious super-city and becomes a captive of the savage Exxilons. Worst of all, the Doctor's greatest enemies, the Daleks, arrive on a secret mission of their own. The Doctor and Sarah must risk their lives time and again in a desperate attempt to foil the Daleks and save millions of humans from a horrific plague.
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When gangster Tommy Ramsey is released from prison, he is determined to retake control of his 1950s East End territory. But new arrivals threaten his grip on illegal activity in the area. An evangelical minister is persuading people to seek redemption from their sins. A new gang is claiming the streets. And a watchmaker called Smith is leading a revolt against the Ramsey Mob's protection racket. When Tommy strikes back at his enemies, a far more terrifying threat is revealed. Within hours the city's air turns into nerve gas and thousands succumb to the choking fumes. London is dying...
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When an RAF squadron shoots down an unidentified aircraft over Turelhampton, the village is immediately evacuated. But why is the village still guarded by troops in 2001? When a television documentary crew break through the cordon looking for a story, they find they've recorded more than they'd bargained for. Caught up in both a deadly conspiracy and a historical mystery, retired Brigadier Lethbridge-Stewart calls upon his old friend the Doctor. Half-glimpsed demons watch from the shadows as the Doctor and the Brigadier travel back in time to discover the last, and deadliest, secret of the Second World War.
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