In the deep South is a fish reputed to have committed a series of violent attacks on humans. This creature is said to be as vicious as a shark, big as a gator. Extreme angler Jeremy Wade heads to Texas to reveal the truth about the notorious Aligator Gar.

In the darkest depths of the Amazon lurks a dinosaur. Legends tell of an evil spirit inhabiting an enormous fish. Taller than a man, it is covered in scales and crushes its prey with a tongue made of bone. Jeremy Wade encounters the legendary Arapaima.