It’s New England, 1892, and family patriarch Rufus Sinclair has just passed away and is believed to be resting in his crypt  or is he? All the bickering relatives are brought to the Sinclair estate for the reading of his will, which has a number of strict demands to be followed or else old Rufus swears he’ll come back to life and make each of them die in a manner that he or she fears the most! Naturally, no one listens to dad (who suffered from catalepsy and feared being buried alive!) and one by one, the murders begin in the most grotesque methods imaginable! A drag race between a hot rodders and bikers winds up at a swinging rock-and-roll beach party where The Del-Aires perform some rockin’ tunes. Nearby, a barrel containing radioactive waste is unloaded from a passing ship, and plunged to the bottom of the sea, splitting against a jagged rock. A peculiar black liquid oozes out covering a human skull, a vicious monster slowly twitches into life, and "The Horror of Party Beach" is born! Soon, several monsters are roaming the area, feeding on human blood to survive! The creatures slaughter their way through a number of victims, including a bikini-clad beauty at the beach party, a slumber party of twenty teenagers, three flirty female motorists, and that’s only the beginning! It’s up to college football hero Hank Green (John Scott) and his scientist father, Dr. Gavin (Allen Laurel) to put an end to the unearthly perpetrators of the attacks!