In an isolated house, a group of friends battle supernatural forces as they try to protect a young woman from an evil cult.

When a virginal artist falls in love with a call girl, she turns out to be the chosen bride of the alien god Cthulhu. To save her, he must stop an ancient cult from summoning their god and destroying mankind.

After conquering R'yleh and the Frozen Kingdom young Howard Lovecraft must now travel to the Undersea Kingdom in order to free his captured family, protect three mysterious magical books, and prevent the impending wrath of Cthulhu.