For generations, the noble polar bears have ruled the Northern Kingdoms. But now, their society is on the brink of collapse and a group of power-hungry bears has seized control. Twin cubs First and Second don't know any of this. When their mother is taken prisoner, the cubs' world falls apart. They know they have to rescue her, but how can two cubs survive a treacherous journey across the ice? Soon, these two unlikely heroes find themselves at the heart of a battle unlike anything Ga'hoole has ever seen.