With images as stunningly captured as in its forerunner "Planet Earth," this Discovery Channel documentary visits two of the world's coldest locales, the Arctic and the Antarctic.
Sir David Attenborough narrates the project, which expectedly probes the sites' icy terrain but also highlights the struggles of their indigenous creatures, such as the polar bear and the wandering albatross. Also considered are the environmental factors that pose present-day threats to the regions. DVD extras: eight "making-of" documentaries; "Production Video Diaries"; video shorts. **** (Not rated) (Also on Blu-ray)