A journey to the polar extremes of our planet, where for most of the year the Arctic and Antarctic are locked in ice. As the sun abandons one pole and journeys to the other, these frozen worlds undergo the most extreme seasonal transformation on the planet -from the total darkness and numbing temperatures of the polar winter to the midnight sun of the summer, when the sun never sets. We meet humpback whales, Emperor penguins, and bears and learn all about how they live.

Alternate title on cover: Planet Earth. Episode #6, Iceworlds.