The Doctor and Peri's first outing together takes a potentially fatal turn when they find themselves embroiled in conflict between federal and rebel forces on the Androzani Minor. However, things get even worse when they come into contact with a deadly substance. This week, Paddy and Tricia follow The Doctor and Peri as they race against time to find a way out of the conflict and a cure for their medical needs. A cure that can only be found in The Caves of Androzani.