It was frozen in glacial ice over 150 million years ago. Global warming has just hatched it in the Arctic. And now, it has travelled to Puerto Vallarta for a massive Mexican buffet of sailors, swimmers, lifeguards, jet skiers, horny tourists, bikini babes and more. It thrives in warm water. Bullets will not pierce its prehistoric armour. And it can leap out of the ocean to devour helicopters and parasailers. Can a rogue fishing boat captain and a sexy science teacher stop this ravenous pliosaur before it takes a monster bite out of the local fiesta and all-girl water polo tournament?