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The Brigadier is pursued across the world from seeming traitors within UNIT, his own organization. The Third Doctor and Liz deal with an alien invasion that started with an extraterrestrial mass exploding in the atmosphere.

The village was cursed centuries ago, but only now is the alien evil beginning to revive ...The children of Hexen Bridge are gifted and clever, but insanity and murder follow in their wake. The Doctor has a special interest in the village, but on his return to England in the early twenty-first century events seem to be escalating out of control.

Kidnapped and taken to Liverpool, the Doctor realises that developments in Hexen Bridge have horrifying repercussions for the rest of the country. Ace is left in the village, where small-minded prejudices and unsettled scores are flaring into violence. As scarecrows fashioned from the bodies of the recent and ancient dead stalk the country lanes around Hexen Bridge, a sinister dark stain is spreading over the surrounding fields. And as the fierce evil grows ever stronger, can the Doctor and Ace prevent it from engulfing the entire world? Featuring the Seventh Doctor and Ace, this adventure takes place between the TV stories The Curse of Fenric and Survival.

Two alien races the Jex and the Canavitchi are engaged in a battle to invade and either conquer or destroy the planet Earth. The Fifth Doctor is summoned to a meeting with Brigadier who shows him a photograph of a powerful media mogul named Sanger who has bought enough plutonium to destroy the world ten times over. UNIT are on the case and it seems that Sanger is one of a frightening number of alien Jex who came to Earth twenty years ago to sow the seeds of their ruthless world-domination When the Canavitchi launch their counter-attack and their alien fleets embark upon full-scale destruction, the Doctor finds himself engaged in a race against time to save planet Earth.

Byzantium. The imperial city - rising dramatically, as if by a trick of the light, from the peninsula of the Bosphorus and the Black Sea. Its domes and towers and minarets overlook a place of intrigue, lust, power, oppression, resistance and murder. Romans, Greeks, Zealots, Pharisees... all meet in the market squares of the great city, but mutual loathing and suspicion are rife. In this cauldron, the Doctor and his companions arrive, expecting to view the splendour and civilisation of the Roman empire. But events cast them into a deadly maelstrom of social and political upheaval. In the eye of the hurricane they must each face the possibility of being stranded, alone and far away from their own times, in an alien culture bunker.