The emperors are the largest and strongest penguins, living in the coldest and most extreme environment on Earth. Embedded with an Antarctic colony, National Geographic Explorer Bertie Gregory encounters social skills never filmed before, discovering bonds forged from birth between family, friends and strangers are the difference between life and death.

It takes a special type of courageous penguin to survive the fierce Southern Ocean, but 40 million crowd its isolated, rocky outposts, and they are some of the most successful penguins on Earth. National Geographic Explorer Bertie Gregory follows the rockhoppers, gentoos and macaronis to discover a world of risk-takers, rebels and unconventional parents.