Fred buys a gangster's car for almost nothing from a police auction, but his plan goes wrong when Big Sparkle and his men, three gangsters, track the car down and plot to kill Fred and Barney off.

The Hatrocks come to visit the Flintstones after they declare their feud over, and wind up overstaying their welcome. The Flintstones then recruit their neighbors, the Gruesomes, to scare the Hatrocks away by performing "bug music".