After much effort they finally get it open and Hiccup is able to retrieve the device from a distracted Dagur. The series was announced by Cartoon Network on October 12, 2010. Using Mala's advice to look at things differently, Hiccup learns to use the Sentinel's behavior and abilities to his advantage and with help from the Eruptodon, manage to escape, and Hiccup destroys Tuffnut's guide to ensure that no other human will discover Vanaheim. Mala is finally convinced that the riders are allies of the dragons and the two groups align to defeat the hunters for good. Upset over his father's lack of faith of him, Snotlout tosses the axe in anger down on an island where it is found stuck to the magnetic hide of a new dragon — the Armorwing.
When he finds information and a map about an island inhabited by Night Furies within Bork's notes, Hiccup is determined to bring Toothless to his family. When they return, the riders re-welcome Heather while offering their support and she and Astrid take the time to bond. While looking it over, the riders believe Viggo is keeping them from something on a nearby island. They come across an island that they think is perfect only to wake in the morning to find that their dragons have been trapped by an amber spitting dragon they call the Death Song. De Marco January 8, 2016 2016-01-08 Spitelout comes to Dragon's Edge to announce a union between the Jorgenson and Hofferson clans and charges last pick Snotlout with delivering the Jorgenson family axe to the Isle of Frigga for the ceremony. Even Hiccup and Astrid's return does nothing to even the odds and things become worse when Fishlegs is separated from the group, though manages to return with help from his old friend Darkvarg. Stoick threatens Ryker to tell Viggo to call off the bounty and the masked man, seeing no chance to take Hiccup to Viggo himself, escapes.
Hiccup and Astrid realize their relationship compromises their mission and promise to remain professional as the other riders finally learn their secret cementing their relationship. Hiccup plans to use the Flightmare's mist to paralyze the hunters, but Viggo's advanced tactics allow him to escape with the Flightmare, Heather and Windshear as captives, leaving Hiccup to wonder about their dangerous new opponent. The young Stinger is torn between its pack and the riders, but Hiccup convinces it to go back with its family. The dragon riders fight off the Changewings and free the leader. Despite Gobber and Hiccup's insistence, he is unwilling to trust any new traders that come to Berk. This, however, turns out to be a trap by Krogan and the Hunters, who capture Windshear and demand the gem on Heather's belt, a lens for the Dragon Eye, in exchange for her life. Feeling guilty over her mistake, Minden, with Snotlout's aid, recovers the hidden Dragon Eye lens on their island, which the Flyers have come for.
Toothless appears to be the only exception until he too begins to rebel, but the riders discover to be the true cause to be freshwater-dwelling parasitic dragons called Grimoras. Heather, Fishlegs, and Dagur face difficulty saving them due to Viggo's dragon-proof ships until Heather and Dagur work together to take down the fleet. The two escape into the ship graveyard and Hiccup decides to lure it towards Ryker, Dagur, and the hunters to incapacitate it, but his plan backfires and the hunters capture the Skrill. They find he has already established the storehouse on another island and has been defending it from an attacking Singetail. Meanwhile, the Wingmaidens entrust the egg with Valka, Stoick recovers from his injuries, Mala and Dagur are married, Fishlegs and Snotlout both begin courting Ruffnut, Hiccup decides to destroy both Dragon Eyes to prevent them from falling into the wrong hands and the Riders leave the Edge to return to Berk. They learn that Dagur has been working undercover trying to save Shattermaster from the Hunters, convincing the two to help him save his dragon and the captured Gronkles. Astrid and Ruffnut reconcile and the riders lead the wild dragons to a new home on the Edge.
The riders and their allies storm his base, only to find it in ruins along with an injured Viggo. Fishlegs believes he has found the perfect candidate, but it turns out to be home to Slitherwings, venomous serpentine dragons that poison Stormfly as she defends Garff to trigger strange wild behavior. The riders find out the Hunters are forcing the Shell Fire to attack but are unable to get close as the attacks trigger the Edge's volcano. Despite Hiccup's orders, Astrid allows Garff to accompany them back to the Edge and to rescue Krogan's Deathsong. With the help of a wild Thunderdrum, Hiccup uses Monstrous Nightmare gel that Snotlout brought with him to warm the hardened mucus and free the group. Meanwhile, Snotlout, as a result of his saving Mala's life from the Hunters, undergoes The Trials, a series of tests to prove himself as King of the Defenders of the Wing. Snotlout and Gustav work together to free Dagur, but bit by bit under the gravity of the situation and Snotlout's pressure, Gustav's confidence wanes until he admits his cheating while under Dagur's tutelage.
In the commander's quarters of 'The Reaper', Hiccup finds a very mysterious device and after a struggle with Dagur all of the group, apart from Hiccup, are trapped in a cage. Later, an injured Heather and Windshear return from Vanaheim with dire news. He manages to pass two life-threatening trials but fails in the third, though Mala commends his effort and makes him a guest of honor in a celebratory feast. They suddenly realise that the Night Terrors, under the command of their Alpha, a white Night Terror, need to flock into a shape of a giant version of themselves or any other dragon they wish as a defense mechanism to scare off threats or predators. Meanwhile, Fishlegs discovers Dragon Root, which could end up affecting not just Stormfly and Hookfang, but all their dragons. Hiccup and Fishlegs face continuous difficulties working together to deliver the egg, and things are made worse when a pack of wild Fire Terrors inhabiting the cave kidnap the egg. After arriving, he immediately finds one and tries to train but discovers it is very aggressive and has the unusual ability to mimic the fire blasts of other dragons, such as a Gronkle's lava blast and Nadder's magnesium fire breath.
Dagur then attempts to take on Hiccup and Toothless with the Skrill, but he doesn't have Hiccup's experience with dragons and the dangerous Skrill proves more than either of them can handle. Upon landing there, they find the island has been taken over by a massive new dragon called the Catastrophic Quaken. So with the help of Fishlegs, Hiccup, and their dragons they discover that the dragon uses a paralyzing mist to attack and plan to drive the Flightmare away. Using a Skrill as a diversion, Hiccup and Viggo enter their headquarters where Viggo betrays Hiccup to earn favor with Johann and Krogan once more. He stays behind to fight off Johann's men with the Skrill, giving Hiccup and Toothless time to escape. Johann is able to distract the twins and lead Hiccup to the Sandbuster's lair, where he reveals his deception and demands that Hiccup hand over the lenses.
Just as they are about to imprison the Skrill again, Hiccup decides against it, and the Skrill is set free. Believing them to have been in league with the Hunters all along, Mala swears to kill Hiccup herself. Archived from on August 8, 2012. Working together with the Gronkles and Quakens of Dark Deep, the Riders manage to stabilize the volcano, and decide to hold off on returning home to stop the Hunters once and for all. While Hiccup and the other teens openly welcome the newcomer, Astrid's jealousy turns to suspicion when she notices Heather is taking an unusual interest in the Book of Dragons. The other riders interrogate the hunters for information on their whereabouts and trick them into sending word to the arena and following the Terror to their location.
This causes Toothless to come down with the dragons' version of Eel Pox, skittish and uncontrollable fire power. Hiccup rescues Viggo from his burning cell and agrees to work together to stop Ryker by using the Submaripper, the Shell Fire's natural enemy, to destroy the fleet while the Defenders' baby Eruptodon helps control the volcano's lava flow. One by one the riders cure their dragons using salt water, and agree to take vacations at home while Hiccup promises to lighten up on his Viggo obsession. He is rescued by the A team but is left in a state as a result of his injuries. Astrid brings the other riders to a cave where the Snow Wraith is hibernating, while Heather's attempts to mislead Ryker fail and he finds the cave on his own.