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When a new tidal class dragon, the Sea Shocker, is found in Edge Cove, the riders must help it escape a group of hungry Scauldrons and reunite it with its migrating pod.
Tuff and Astrid continue to defend Dragon's Edge, while Hiccup, Snotlout and Johann discover an island full of wounded dragons that have been hunted and hurt by the Dragon Hunters.
The Skrill returns with a vendetta against Hiccup and Toothless. Hiccup and the Riders must choose a new course of action to stop the rampaging dragon.