Nature

Superfish

They slice through the water's surface with explosive power, sail, spear and a half ton of muscle flashing in the sun. Their journeys through the open ocean are epic, their life cycle, bizarre. They are the billfish -- marlin, sailfish, spearfish and swordfish -- the largest and most highly prized of all gamefish. Emmy award-winning filmmaker and biologist Rick Rosenthal brings these incredible sea creatures to the screen as he observes tiny billfish nurseries in the wild, dives deep into secret undersea canyons, films incredible color-changing behavior and embarks on a quest for an elusive thousand-pound "grander."