This fantasy movie tells the story of a far away land, where a ruthless and tyrannical king rules over the citizens with an iron fist. But there is a prophecy in ancient folklore that tells of a single man that is destined to free the citizens of his nation, delivering them to the promised land of Promethea. Rising among the ranks of ordinary people, one warrior steps into the role told of in legends.

In Louisiana, the thirty-five year old single mother Lavina delivers a baby boy and a monster in the evil Whateley House. Ten years later, Dr. Henry Armitage and his assistant Professor Fay Morgan discover that the page 751 of every copy of the Necronomicon is missing and The Black Brotherhood has summoned the gate keeper Yog Sothoth to leave the portal opened to the demons and ancient gods. They invite the arrogant and skeptical Professor Walter Rice that can translate the Necronomicon to help them to seek the book. Meanwhile Lavina's son Wilbur Whateley ages very fast and seeks the missing page to open the portal.

Open on gorgeous swamplands of the Atchafalaya Basin in the summer. Lots of beautiful teens are at the beach the weekend before Gator Fest. That night an animal smuggling deal goes wrong and a large sea creature escapes into a swampy backwoods river. At the McDaniel's "Gator Shack" restaurant, a local, Jackson is drunk, and gets mangled to bits. The town sheriff blames the carnage on the McDaniel's "escaped" pack of gators and tries hauling them off to jail. Rachel McDaniel, head of the family, claims to have seen the fin of a shark! Rachel and her family, along with the help of a mysterious stranger, Charlie, take on the Swampshark and the law to clear their names, save Rachel's kid sister Krystal and prevent the unwitting folks at the upcoming Gator Fest from being torn to shreds by a beast the likes of which no one has ever seen!