While helping with the laundry, Courage answers a knock at the door to greet Professor Frith, who found a Mayan pyramid. While there, he accidentally awakened (in a rather humorous manner) and was attacked by the mummy of a long dead baker. The mummy was the baker for a Mayan princess who loved cookies. The Poohbah, a royal adviser of the princess, would take the cookies to the princess everyday, but would take some for his own greed. The baker catches the Poohbah and is about to tell the princess, but the adviser got to her first. When asked, the Poohbah told the princess that the Royal Baker was the one at fault. The princess ordered that the Royal Baker would have his "mouth sewn shut, his eyebrows plucked, and the rest of him mummified." When the professor finished his tale, Courage tries to find a way to protect Muriel and Eustace. Hypnotizing sounded like a good idea, and as such, Courage hypnotized the two into thinking that they were the Mayan Princess and the Poohbah.
The Baker flies to Nowhere in a plane, where the Parachute Lady drives him crazy with random chatter, and he steals her parachute and jumps off the plane. He is then seen just outside of Nowhere, hitching a ride with Di Lung to get to the Bagge Farmhouse.
When the mummy came, Eustace/Poohbah told the princess that it was the Royal Baker's fault that the cookies were gone. Putting a sign on the mummy's back, saying that he did it, the Mayan Princess/Muriel orders the same thing that had happened to the Mummy many years ago. Thinking quickly before the Mummy could kill the Mayan Princess/Muriel, Courage asks Eustace/Poohbah for something to eat for some money. In agreement, the Poohbah starts digging in his clothing. Courage moves him, so everybody could see the cookies that the Poohbah had taken. The princess demands that his mouth be sewn shut, his eyebrows plucked, and rest of him mummified. In the end, the Mummy goes back to his pyramid, and the others sit down for some cookies. Professor Frith wakes up, having fallen asleep, and asks what happened to the Mummy. After explaining what had happened, Muriel tells them that she gave the Mummy a new blanket. Eustace asks which one, and Muriel explains the polka-dotted one. Eustace rushes from the house, and in the next scene of the Mummy's Mesoamerican pyramid, we see the Mummy sleeping inside the polka-dotted blanket, and Eustace tied up in the old bandages shouting at him to return his blanket.
- Muriel Bagge
- Eustace Bagge
- Professor Frith
- Di Lung (cameo)
- Parachute Lady (cameo)
- Elephant (cameo)
- Mayan Baker (until the Princess/Muriel claims the Poohbah/Eustace's guilt)