When Snotlout and Astrid are given the task of transporting a ceremonial battle axe to a wedding between their two families, they must put aside their differences when the axe is taken by a new type of dragon – the Armorwing.

Hiccup and the Riders must stop Ryker from creating a key to the Dragon Eye, which means a return trip to Glacier Island, this time to protect the Snow Wraith.