Resolving to stop the Norse trickster Loki from invading Pinewood Bluffs with his army of monsters, Owen, Dana, Jon and Sydney stow away on Loki's sledge and find themselves in an underworld, where they face complicated challenges.
Pinewood Bluffs is under attack and Dana's parents are missing, Owen, Dana, Jon, and Sydney must find a powerful Crystal Rune before Loki can get to it.