Rocket Osborn returns with all his friends to unravel a baffling mystery. When the annual light festival is interrupted, Rocket is sent on a harrowing mission from Santa Claus to find the truth to these important questions. What has happened to the Harp Seals and Whales? Where did the Lights go? And where is the legendary Fire Fox? On his journey, Rocket learns just how important the Light Festival is to all the creatures in the arctic and to solve this mystery he must track down a creature only known as "W." Along the way, Rocket finds that he must trust his friends and make a true team effort to solve the riddle of the Fire Fox.