丹尼斯在冰天雪地的北极圈，发现了史前时代的大怪物，当它被从雪地挖出来时血液竟然是热的，于是引来科学家的研究。不料一个严重的疏忽，冷藏怪物的大冰库被打开，怪物开始融化、苏醒，也开始屠杀人类，毁灭一切......

The Viking children Røskva and Tjalfe embark on an adventurous journey from Midgard to Valhalla with the gods Thor and Loki. Life in Valhalla, however, turns out to be threatened by the dreaded Fenrir wolf and the god's barbaric archenemie…