Dave forces Alvin, Simon, and Theodore to clean the attic, the garage, and mow the lawn respectively. After they receive some fan mail from Mexico, the boys decide to go to Siesta Grande to look through ruins. Once they arrive they quickly leave Dave to listen to Pedro, their fan at an orphanage, about the lost city. Later the ditch Dave again, who hangs at the beach, to find more information at the local museum. Meanwhile, Dave learns of the real reason they are in Siesta Grande. When Mr. Digbe doesn't provide enough information, they visit Wings Walker, a forgetful pilot. He agrees to help the boys find the ruins if they assist him in finding Sadie, his plane. On the way to their hotel Pedro is kidnapped by Mr. Digbe and neither Dave or The Chipmunks can find each other. While Dave and Mr. Digbe look for them, the boy's find Sadie's, a restaurant, instead. They are forced to wash dishes when they can't pay but learn the location of Walker's plane.
- This episode was produced by Murakami-Wolf-Swenson.
- This was the first of six episodes to premiere in syndication.