00:0070 million years ago, giants roam at the top of the world.
00:14At this prehistoric North Pole, summers are warm.
00:18A chance for hatchling dinosaurs to fatten their bellies.
00:22Unaware their safe and happy world is about to change forever.
00:31As winter sets in, plants will shrivel and die.
00:36Temperatures will plummet.
00:38And four months of darkness will engulf the land as night hunters stalk the weak.
00:50Winter at the North Pole is a death trap with just one way out.
00:55An epic annual crossing of a continent.
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