Lincoln Costain, a mid-19th century Texan cowboy is shanghaid and placed aboard a ship bound for Hawaii. After he jumps ship off the coast of Kauai, a 12-year-old boy rescues him from drowning. While Lincoln waits for a way to return home, he decides to help the boy's mother's failing potato plantation by turning it into a cattle ranch. But first, he must outwit an unscrupulous businessman, outfight an evil witch doctor and turn the easy-going islanders into ridin' and ropin' cowpokes.