Grandpa discovered three new creatures - the Sub-o-saur, Long-tailed Swamp Fish, and Septafin - and needs to feed them that evening. However, he is too busy and asks his friend Glob to feed them instead. Glob cannot read the labels on the food buckets to identify which creature eats what. Grandpa decides to draw pictures of the creatures so Glob can tell them apart and feed each one the correct food.