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？收起
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