Gustafer Yellowgold is a friendly, yellow, cone-headed fellow, who came to Earth from the sun and has an interesting magnetism for making friends with some of Earth's odder creatures. His best friend is Forrest Applecrumbie, the smartly dressed pterodactyl, with whom he built a small cottage-style home on the edge of an uncharted wooded area in Minnesota. Gustafer has a pet eel named Slim (short for Slimothy) and a dragon named Asparagus who lives in his fireplace. For recreation, he enjoys punching cheese and jumping on cake.