Drawn to the Greek island of Synanon in the Aegean Sea young and pretty¸ as well as virgin¸ Madeline¸Deborah Shelton¸ inadvertently with the help of Frye¸ James Earl Jones¸and his girlfriend Barbara¸ Lydia Cornell¸ releases from a hidden underwater cave an ancient monster who goes on a bloody rampage. Killing islanders on the Island as well as those swimming off shore. Were told by the wise old men of the Island¸ from it’s mayor on down¸ that the only way to stop the monster from it’s deadly rounds is to offer up a young girl or woman virgin as a sacrifice to it.