In the opening episode of the trilogy Winter starts to release her iron grip as we meet an unforgettable cast of Northern animals  - the Stormborn! A single Arctic fox scurries across the mountains. He's on a mission to re-unite with his mate from last year, but has she survived the harsh Icelandic Winter? All he can do is wait. In Shetland a mother otter has successfully raised her twin cubs - one male, one female, to the brink of independence but their journey will be far from easy  - a dog otter is hanging around and determined to cause trouble. Finally re-united on the beach, the Arctic foxes enjoy a courtship in the snow while across the North Sea in the mountains of Norway a vast reindeer herd starts an epic descent down to the calving grounds. A huge March storm rages across all the Stormborn lands, disrupting the foxes mating and reindeers journey. But the otter family is the most keenly effected. Separated from the rest of her family the female cubs becomes isolated and afraid.