Planet Earth - From Pole to Pole

Documentary series which celebrates our planet in all its glory, both its spectacular scenery and its captivating natural history. This episode looks at the influence of the sun and reveals how its seasonal journey affects the lives of all creatures. As spring arrives in the Arctic, a mother polar bear emerges from her den with two tiny cubs. At the other end of the planet, winter arrives and emperor penguins are plunged into darkness for four months.