The Crew of the TARDIS sets out to replenish supplies when they run into an unexpected foe - and only the Doctor can stop him.
After five minutes in the Zero Room, the Fifth Doctor feels hungry and goes out to look for food. After discovering that they are out of food, the TARDIS team arrives at a supermarket. Deciding on pizza, Adric goes out to get the food and encounters an old lady. Meanwhile, the Doctor, Tegan and Nyssa wonder what had happened to Adric. After arriving at the freezer, they discover that Adric is trapped inside of it. Then without warning, they are thrown into the freezer from the old lady's trolley. The old lady then removes the disguise to reveal that she was the Master all along.
The Doctor then gets out his sonic screwdriver and free them from the freezer. After getting out, they discover that the Master has converted the supermarket into a maze. The Doctor decides to use peas so that they can mark where they had been and used that escape from the maze. Once out, they discover that the truck that they had parked the TARDIS on, had left. With extraordinary luck, however, the truck has just left a car wash. Back in the TARDIS, the Doctor finds he needs another rest in the Zero room.