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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.
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.
The Riders learn from Heather that the Dragon Hunters are after the Flightmare. The Rides race to free the dragon. But could this be part of a larger scheme?