Shawn and Marlon's latest scheme becomes a hair-raising nightmare when they take over the manufacture and marketing of a grooming product called "Goop, Hair It Is." Marlon comes up with a concoction that makes his hair look great. Shawn decides to sell the hair goop on an infomercial. They shoot the infomercial live, with Gary Coleman acting as a celebrity spokesperson. While Gary is doing his pitch for "Goop Hair-It-Is," the chemicals from the product cause his hair to catch fire. Shawn and Marlon's dreams of becoming successful entrepreneurs also go down in flames.