Hogan goes in search of one of North America's toothiest and most misunderstood monster fish: the alligator gar. We'll join a band of scientists in some unlikely places to see what characteristics equipped this prehistoric fish to survive over the centuries: a mouthful of teeth, toxic eggs, impenetrable scales and the ability to breathe air. Today, alligator gars are facing a new threat -- and Hogan is determined to find out if this fish will be able to survive in a modern world.