 Hercules hears from young pupil Theseus that his mentor and virtual stepfather, the centaur Ceridian, is dying and drops everything to rush thereto. He is asked to attempt to talk some sense into a former centaur pupil, Cassius, who has turned on all humans because the local magistrate banned the species from town including the water spring, even forsaking his girlfriend, the local school principal Perdidis s daughter Mirra. Salmoneus, who was promoting  air sandals , offers to mind Ceridian while Herc braves both angry parties and tries to restore peace and unveils a criminal plot around the magistrate.