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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.

A fireball crash lands in the forests of the Ukraine and when the locals investigate, they find what appears to be a metal coffin at the center of the devastation. They superstitiously conclude that the casket contains the body of an angel sent to Earth to give hope to the people.

Centuries later the First Doctor and his companions, Stephen and Dodo, find themselves trapped in Kiev, 1240 -- a city under attack by the Mongols. They are enforced guests of the governor, Dmitri, whose assistant Yehven believes that if the coffin is desecrated, then "all who threaten us will be destroyed".

When the coffin is opened by a group of men, a terrifying, skull-faced creature is freed, and kills a member of the group before fleeing. A spate of violent deaths ensue -- but this creature certainly isn't killing indiscriminately. How is this creature choosing its victims? Where has it come from -- and most importantly, can the Doctor do anything to halt its murderous trail of destruction?