Based on Lovecraft's classic: a huge, feline sea monster, that came from the stars hundreds of millions of years ago, to destroy the elder beings on our world.
Now, trapped in a sunken tomb at the bottom of the ocean, this ancient being is destined to emerge from his slumber in an apocalyptic age.
When the stars are right again, a band of innocent sailors awake Cathulhu and the kitten gives chase, pouncing into the ocean after them.
Despite a blow to Cathulhu's head, bursting it; the creature immediately starts to reform, whiskers and all.
Can the sailors drag Cathulhu down to the sinking city and keep humanity safe again?