The movie picks up right after Scorpion's Revenge where the heroes are attacked by Shao Kahn, which will force Raiden and his group of warriors into a deal to compete in a final Mortal Kombat that will determine the fate of the realms. This forces the good guys to travel to Outworld defend Earthrealm while Scorpion journeys to find the Kamidogu (a mystic relic made by the almighty Elder Gods) before it is used to bring back the mysterious One Being, who would destroy the universe.
Every year, the elves come from his magical world to bring humans a new spring. Tim is a new one this year. Distracted by the attractive sound of the fair, he wanders away from the other elves, being captured by former trapeze artist Samuel, who brings him to Vladimir, owner of a circus who exploits him as a fairground attraction. Teresa, a naughty 6-year-old girl, is jealous of her little brother, baby Jon. When visiting the fair, she discovers Tim while he is being exhibited and she will become infatuated with him. Tim, at the same time, will see in her an opportunity to escape. Hidden in Teresa's house and protected by her, they live several adventures, becoming inseparable friends. Over time, matching with the end of the spring, Tim begins to transform in a Little tree. He has been away from his world and his people for too long, and only by helping him to return will Tim be saved. There is no time to lose, but be careful Vladimir is lurking.
远在北欧大海中央的博克岛，即将迎来一年一度的快乐圣诞节。希卡普（杰伊·巴鲁切尔 Jay Baruchel 配音）和他的好朋友无牙一如既往，在博克岛的上空自由翱翔。可是，突然天空布满了各种各样的龙，甚至连岛上的龙也振翅高飞随这群龙远去。岛民们非常失落，但也只能面对龙离去的事实。未过多久，连无牙也在某个机缘下振翅高飞。过了数日，无牙始终没有返回，这令希卡普非常失落。某天，他被夺门而出的胖龙Meatlug撞到空中，继而随着它来到了一片陌生的小岛。在那里，希卡普发现了所有失踪的龙，也明白了他们离开博克岛的原因…… 而他的好朋友无牙究竟又在哪里呢？
