Since Moonbeam Swiner is The Pigkeeper's Daughter, it's no surprise that her best friend in the whole wide world is a little piggy named Lord Hamilton. And that has her Ma worried. After all, Moonbeam has reached the ripe old age of 19 and she still ain't hitched yet. So when a traveling salesman from the big city arrives on the scene, Ma quickly out-cons the con-artist and Pa arranges a shotgun wedding.

A crazed military explosives expert heads for Los Angeles with an RV full of explosives, intending to blow up a rock festival and kill all the "hippies". An army officer is sent to stop him.