In the second episode of the four-part story "Carnival of Monsters," the Doctor (Jon Pertwee) and Jo (Katy Manning) have apparently materialized on an ocean liner in the year 1935. But the time-travelers soon discover that the ship is actually a tiny scale model and that they have been miniaturized and trapped inside a carnival sideshow device called the Miniscope.
In the third episode of the four-part story "Carnival of Monsters," the miniaturized Doctor (Jon Pertwee) and Jo (Katy Manning) are still imprisoned in the Miniscope, an intergalactic carnival sideshow device. Hoping for a quick getaway, the Doctor matches wits with Vorg (Leslie Dwyer), a crooked carnival entrepreneur from the planet Lurman. Meanwhile, a revolution breaks out on the planet where the Miniscope has been put on display by Vorg and his equally disreputable assistant, Shirna (Cheryl Hall).
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.