Mr. Bumpy is a small green, purple-warted monster living under the bed of a ten-year-old boy, where he eats dirty socks and dust bunnies as if they were delicacies. His best friends are Squishington, a blue monster that lived in the bathroom's toilet cistern; and Molly Coddle, a Frankenstein's monster-like rag doll belonging to the boy's sister who acts as the comic foil to the other's crazy antics.