J.J. Pierson is a multi-millionaire industrialist and entrepreneur who owns Pierson Industries, a robotics company. While on a vacation at The Castaways Resort, he discovers a strange new element he calls Supremium which he has analyzed by Dr. Olga Smetna, one of the scientists of his company. When they discover the element is capable of producing incredible energy, Pierson schemes to gain control of the island through the former castaways, who are silent partners in the resort. He lures Ginger into signing a phony movie contract and and having his robot servant, George, strong-arm Gilligan into signing away his shares before having him taken hostage. He also gets Mary Ann tipsy on champagne to get her to sign away her shares. After the Skipper and Gilligan warn Thurston Howell IV of Pierson's schemes, Pierson wagers the shares for his shares in a game between the Harlem Globetrotters and his robot basketball team, the New Invincibles. The robot team are invincible against the Globetrotters until the Professor reminds them that the robots can't think, and they turn the game around in the last half using their nonsensical moves and creative plays. Having lost the rights, Pierson reveals the whole game was just a distraction as more of his robots secretly mined the Supremium and stored it on his yacht. It is then revealed that Supremium is unstable out of its natural habitat, and Pierson's yacht explodes in a huge explosion, destroying all samples and leaving Pierson with nothing.
- J.J. Pierson was played by television actor Martin Landau.