Fountain of Terror/Fiddler on the Loose

Dr. Curtis Conner goes missing in the Florida swamps after finding the Fountain of Youth. When Spidey investigates the scientist's disappearance, he discovers a fifteenth century Spanish conquistador, Ponce de Leon, who is intent upon keeping the magical fountain a secret. Because he hates rock-and-roll for its having replaced classical music in the tastes of the masses, a fiddler with a deadly, sonic violin seeks revenge upon pop-music sponsor Cyrus Flintridge.