The U.S. Navy's special group "Blue Water" builds a half-shark, half-octopus for combat. But the sharktopus escapes and terrorizes the beaches of Puerto Vallarta.
Following in the footsteps of her late fiancée, who drowned under mysterious circumstances, Rebecca (played by Katie Savoy) and her film crew are in China making a documentary about the Chinese Ghost Festival. There, she learns of a story about a concubine Chan Ju Chi who is violently murdered and thrown into a well by the head concubine Ping Wei (Played by JuJu Chan) within the secret grounds of a palace. Legend has it that the Chan Ju Chi has risen to become a "jiangshi", killing innocent people in the hope of taking over their bodies. Things take a turn when a worker is attacked in a decrepit well within an old palace. Rebecca tries to piece together the mystery behind the legend as one by one the people she knows are gruesomely murdered.