Professor Pericles creates a herd of mutant cattle (which he had bred from cattle, piranhas, and bees) to destroy Crystal Cove in an attempt to locate the Planispheric Disk. As the herd begins devouring the town, the gang, Mayor Nettles, and Sheriff Stone use Ex-Mayor Jones’ helicopter to trap the herd’s queen. The cattle follow the gang as they leave town in an attempt to protect their queen. Watching from afar, Professor Pericles orders Brad and Judy to shoot the helicopter down. The missile strikes the chopper and as Mayor Nettles attempts to land safely, Nova falls out and is nearly trampled to death by the herd. The queen cattle is dropped into the ocean as the herd scatters. Scooby-Doo then has everyone get Nova to the hospital.
