S1, E2: It's summer in the North Atlantic, and nearly 24 hours of daylight have transformed much of this snow-clad world. Newborns arrive across the "Stormborn" lands, and the race is in full swing to take advantage of the brief bounty before winter returns. Actor Ewan McGregor narrates the stories of two Arctic fox clans struggling to raise their cubs on Iceland's remote volcanic shores, reindeer calves taking their first steps in the mountains of Norway, and an otter family in Scotland facing up to a brave new world.