The crew faces-off with a back-breaking, 200-pound giant in the deep waters of the Pacific Ocean, as they seek to help save the white sturgeon's favourite food; the mighty Pacific salmon. Their mission takes them far out to sea, and deeper into the rugged mountains than they've ever been before. To find these elusive warrior fish, they must brave massive waves, raft down treacherous, frigid rapids, and evade hunting grizzly bears.