While building a tinker-toy high-rise structure, Prickle and Goo are incessantly bothered by the mischievous Blockheads, who attempt to destroy the structure by catapulting watermelons at Prickle and trying to knock it over with a bulldozer. Goo captures the Blockheads in a unique fashion and takes them to the top of the tower where they are mounted as gargoyles for punishment.