On an unnamed tropical island group: Prof. Irwin Hayden, an archaeologist; Lincoln "Link" Simmons, the professor's youthful assistant; and Leslie, the professor's daughter, who serves as both a love interest for Link and the series' token damsel in distress are joined on their quest by Morgan, a shipwrecked merchant mariner, and his sidekick Chongo, who speaks only in a series of monkey-like chatters and birdcalls who are searching for the mythical lost city of Tobanya but they are pursued by a group of bumbling, but heavily armed, modern-day pirates led by the murderous Captain Mu-Tan, and by three tribes of cannibal natives known as "the Headhunters", "the Skeleton Men" and "the Ash Men".
