Stargate SG-1: 14. Valhalla

Upon the legendary fields of Valhalla, the spirits of Viking warriors do eternal battle in service to their god, Odin. By night they feast and toast the fallen, but at dawn the dead are restored to fight until the end of times.

When SG-1 find themselves trapped in this endless battle,prisoners of Odin, they must discover the strange truth about Valhalla before it is too late - and then confront the giant, Surtr, a terrible and immortal enemy bent on revenging himself against his god.

In order to defeat Surtr, Carter suggests using a naquadrium power cell Jonas Quinn has developed on his home world, but when she and Colonel O'Neill arrive on Langara they realize their problems have only just begun...