The Visitation The Doctor, Tegan, Nyssa and Adric arrive in England in 1666. There, they must thwart the plans of a marooned Terileptil who intends to wipe out human life on Earth with a virulent plague. Black Orchid In England, 1925, the Doctor is invited to a fancy dress ball at Cranleigh Hall. But the Cranleigh family hides a dark secret, and the party mood is soon shattered when a murder is discovered. Earthshock The Doctor must prevent the Cybermen from destroying the Earth, but not everyone will survive the fight against them. Time-Flight When a Concorde vanishes mid-flight, the Doctor tracks it down to Earth's prehistoric past where the crew and passengers have become the slaves of the mysterious sorcerer Kalid.