Journeying from pole to pole, we reveal the surprising frozen worlds that exist across the planet and the remarkable animals that make them their home.

At the top of our planet lies the Arctic Ocean - a shape-shifting world of ice and water, home to unique animals like polar bears, harp seals and bowhead whales.

A look at how mountains create unique frozen worlds, home to extraordinary animals that must overcome the crushing conditions of the cold.

Antarctica is the most hostile of earth’s frozen worlds. Yet even here, life finds a way not just to survive, but thrive.

In the far north of our planet lie vast frozen lands of snow-covered forest and open tundra. These are lands of extremes that push animals to their very limits

Our frozen planet is changing. We meet the scientists dedicating their lives to understanding what these changes mean for animals, people and the world as a whole.