Tom , Mr. Damon and Mr. Titus embark for Peru , and during their trip , encounter Professor Swyington Bumper , who is on a quest to locate the lost city of Pelone .
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 life - long quest to locate the lost city of Pelone .