In the conclusion of the four-part story "Carnival of Monsters," the miniaturized Doctor and Jo attempt to escape from the traveling carnival sideshow display in which they have been imprisoned. Their getaway is impeded by such nuisances as a political revolution, a swarm of carnivorous worms, a pair of crooked carnival entrepreneurs, and a team of obstreperous customs officials. Written by Robert Holmes, "Carnival of Monsters, Episode 4" first aired on February 17, 1973. ~ Hal Erickson, Rovi