Marvin, his family, and his school community can change colors based on the food they eat. He, his family, and his classmates eat unhealthy foods each day. Ms. Weatherbee, Marvin's teacher, introduces the students to the food pyramid. She explains how monsters can trade in unhealthy foods and eat protein, fruits, vegetables, and dairy products and still be their favorite color. Will Marvin, his family, and friends embrace healthy foods?