The mystery of the disappearing people at the sea begins when their bodies are found skeletal, with even the marrow missing. Scientists are baffled by the unknown animal responsible. Dr. Turner hypothesizes that a company's tunnel construction project may have poisoned the environment, causing an octopus to mutate into a giant. Meanwhile, a sailing regatta with many children, including Turner's nephew Tommy, commences.

Tentacles
A colossal, bioengineered octopus rampages through a California coastal community, causing widespread destruction and striking fear into the hearts of its inhabitants.