The Gravelberry Pie King is an episode of The Flintstones. Plot When Fred is fired by Mr. Slate, he thinks up a plan. He and Barney decide to work for P.J. Safestone, owner of Safestone Supermarket, to make money from selling Wilma's gravelberry pies. Trivia Safestone is a parody of Safeway Supermarket. Retrieved from "https://flintstones.fandom.com/wiki/The_Gravelberry_Pie_King?oldid=5870" Categories: Episodes Season 6 Community content is available under CC-BY-SA unless otherwise noted.