chunk: Tom, Mr. Damon and Mr. Titus (along with Koku, Tom's giant) embark for Peru. On the way, they encounter Professor Swyington Bumper, who is on a lifelong quest to locate the lost city of Pelone. Professor Bumper returns to Peru each season, and has thus far been unsuccessful. When Professor Bumper discovers that Tom is headed to the same general area, Rimac, Professor Bumper decides to join the company.