Two teens foil a plot by their wicked neighbor to misuse the energy from a magical universe existing inside mysterious Brown Mountain. The mythological Gorgons, seething for revenge against the human race for the killing of their sister Medusa eons ago, agree to come into the outside world and turn the witch's enemies, both real and imagined, into stone. The twins venture into the realm of light, and, with the help of the residents, defeat the allies in an epic struggle between good and evil.