In the Deep South is a river monster with the reputation of a devil. Blamed for a series of violent attacks on humans, this creature is said to be as vicious as a shark and as big as an alligator. The authorities said it should be annihilated, but not all are so quick to condemn it. Extreme angler Jeremy Wade heads to Texas on its trail in an attempt to uncover the facts behind this animal's notoriety. Helped by local expertise and with his own wits honed sharp, he finds new ways to reveal the truth about the monster alligator gar.