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Tuffnut goes undercover to help the team rescue the Skrill from the Berserkers' grasp.
The riders find a frozen Skrill, a lightning powered dragon, and need to get it off Berk before the Dagur and the Berserkers find out about it.
While searching for dragon traps, Tuffnut falls into a trap with a forest fire bearing toward him. Fortunately, an old friend shows up to help.
Hiccup and friends discover that several islands have vanished, and that their old foe, the Screaming Death, is responsible.
Astrid sets out to confront the Flightmare, a dragon that shamed her family ten years ago.
When Hookfang's flame goes out, the riders must travel to Fireworm Island to reignite it.
When the village well runs dry, Hiccup and Toothless investigate. They soon discover a group of baby Whispering Deaths beneath Berk.
The team decides to practice, without their dragons, against wild ones and come across Dagur hunting dragons on the island.
After being left behind, Fishlegs and Meatlug overeat and discover that different combinations of stones cause Meatlug to produce different types of materials including glass, steel and magnets.
Certain that Alvin is planning an attack on Berk, Stoick institutes a ban on all dragon flying. Hiccup, certain that Alvin will be using his newfound dragon-training knowledge to bolster his attack, forms a secret “Dragon Flight Club” in order to train the kids to defend Berk against Alvin’s dragon army.moreless