Dr. Marcus Garvey Carver II from The Proud Family Movie, is a scientist who experiments in peanut cloning technology. Dr. Carver is a reference to George Washington Carver, who was a prominent African American agricultural scientist and inventor that famously used peanuts in many products; thus, providing the connection between Dr. Marcus Garvey Carver II and peanuts, within The Proud Family movie.
When Dr. Carver's early experiments went evil, he uses a powerful peanut liquefaction gas to turn his evil experiments into peanut butter.