Along Dallas's Trinity River, Jakub Vagner searches for a true Texas titan, the alligator gar. The gar are known for their bony skulls, armorlike scales and piercing teeth, but their natural weapons can't protect them from overfishing and environmental changes. Jakub's mission is to help scientists tag several fish for data and seek out a huge gar to catch and release, hoping to prove that big specimens are still out there. Jakub lands a true behemoth a 125-pound, 6-foot gar!