Bundle up as Lizzie heads north to tag sharks and witness first-hand the slow, sobering disappearance of sea ice. Do time in bear jail with polar bears who are caught raiding a town for food after their icy hunting grounds diminish.

Tag along with Lizzie on her most dangerous atlantic adventure yet; free diving with bull sharks; explore otherworldly gulf coast swamps filled with hungry alligators, crafty snapping turtles and tiny but mighty beach mice who strengthen sand dunes.

Marvel at North America's natural wonders as Lizzie swims through astonishing coral reefs, excavates ancient fossils, and treks through jungles on tropical shores. Observe jaguars prowling a Costa Rican beach and encounter the largest sharks.

Explore the shores of the Northern Territory and the abundant waters of the Great Barrier Reef, facing flooded roads, hungry saltwater crocs and killer jellyfish.

Say goodbye to the tropics and dip into cool southern-coast waters, coming face to face with majestic grey nurse sharks, shape-shifting cuttlefish and huge blue whales.

The trip's final lap visits the land where Australia's desert meets the hostile Indian Ocean. Confront the challenges of survival as Lizzie dives with tiger sharks and manta rays.