Megalodon

Megalodon was spotted in the bay a few years ago, attacking some teens kayaking in the summer. He was driven away for now, and lurks in deeper waters nearby.

Description
A 20 foot long/tall creature with the head of a great white shark and the muscular, broad body that somewhat resembles a mix of man and shark, with bulky arms, legs, and an extended shark tail. His fingers and toes are webbed and end in massive claws. The only thing he's wearing is a black pair of wetsuit shorts that are torn and barely fit him.