Growing weak with old age, Hex is seeking out something to make him stay young. At the same time, Max is having difficulties with his aging body, so he decides to impress his grand-kids at a fair to show them he’s not as elderly as he seems. At the dunking game Max challenged them to, he and Ben both get splashed, unaware that the water is from the Fountain of Youth. Max regresses into a ten-year-old while Ben becomes a four-year-old. Hex manages to force the booth’s owner, Hector, into revealing the location of the fountain as he is its guardian, having been charged to do so by Juan Ponce de León four centuries ago.