After the group traps the leader dragon they realise how much danger the rest of the dragons are in when Changewings begin attacking them. When a fire breaks out on the other side of the island, Minden orders all the guards to put it out, leaving the Wingmaidens defenseless to a surprise attack from the Flyers, resulting in Atali being injured and knocked out. After the twins throw everyone in the 'dungeon' they realise they need the other riders to stop the island becoming a pile of ash. They learn the tribe is guarded by a lava-eating dragon, the Eruptodon, whom Mala and the others label 'The Great Protector,' but Hiccup soon realizes when the Eruptodon is captured that Viggo was using them as a distraction. 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. Just as they are about to celebrate his graduation, Savage and a faction of Berserkers start a revolt and imprison Dagur and the dragons. They attempt to escape but are captured again, and when Dagur proposes to kill them, Heather convinces Ryker to keep them as slaves.
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. Astrid, Ruffnut, and Heather infiltrate the island to save him but in the process learn of the Wingmaiden Tribe's purpose and Windshear's origins in that they raise infant Razorwhips to protect them from being eaten by the males. The riders are cornered in trying to release it, but receive unexpected help from the Skrill itself in sending the hunters away. Through Ruffnut and Tuffnut's mediation, Dagur and Mala actually get along and develop a mutual attraction for one another. The sixth and final season of DreamWorks Dragons: Race to the Edge was released on February 16, 2018. The riders and Berserker siblings battle, and despite Savage capturing Heather, still manage to defeat him, and Dagur, admitting Gustav's apprenticeship was faked to relieve Berk of him for a while, honors Snotlout with a Berserker trophy, though he purposefully gets his name wrong. Upon investigation, they discover it to be a young adult Seashocker having drifted into the cove after being separated from its pod.
Fearing the possibility her condition may be permanent and her Shield Maiden days are over, Astrid still manages to use her other senses to figure out the Triple Stryke's weakness and finally train it. The dragon riders fight off the Changewings and free the leader. But, when Dagur the Deranged escapes from the prison on Outcast Island, he decides to take his revenge on Hiccup. When it is about to escape into the sea, it ends up cornered by the Scauldrons, but is saved by the rest of its pod. After making a plan, they release the captive Singetails only to find the dragons turning on them and forcing the riders to fall back in a cave with no escape.
Hiccup allows himself to stand trial and face their punishments, seeing Mala and her tribe as potential allies in their struggles against the hunters and eventually wins her trust. Fishlegs is reluctant to let the Seashocker leave in the interest of studying it, but is convinced otherwise after it is injured by Stormfly. Sullivan John Tellegen February 17, 2017 2017-02-17 The riders attend Berk's 400 year anniversary, but there is little chance for celebration when they learn Viggo has placed a bounty on Hiccup's head. Hiccup develops a diving bell to dive underwater and Changewing Acid to dissolve the chains, but the Hunters' interruption wakes the sleeping Submaripper. After the Armorwing appears, Hiccup notices a Dragon Eye lens on its back. Sullivan John Tellegen June 26, 2015 2015-06-26 Back on Berk Stoick has asked the riders to deal with a Scauldron which is in the waters around Berk. Convinced that Hookfang has reverted to his old feral nature, Snotlout decides to resign from being a dragon rider.
Snotlout is determined to repay the debt he owes to the Queen for saving Hookfang's life to the point where he refuses help from the other riders. While looking it over, the riders believe Viggo is keeping them from something on a nearby island. . The riders are left only with the resolve to reclaim the Dragon Eye before he can use it. However, Hiccup learns that the co-habitation is far from harmonious with Viking ignorance and the Dragons' instincts threatening to destroy the alliance. Together they meet with Johan who reveals Dagur's plans to purchase new dragon-proof ships and weaponry, and they convince the riders to launch a surprise attack.
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. Gruffnut is revealed to owe money to the Hunters and promised one of the riders' dragons to pay off his debt. Though highly reluctant, Hiccup works together with Dagur to cure Toothless but the two are captured and Dagur appears to abandon Hiccup, but later comes back riding Toothless to save him. Just as they are about to imprison the Skrill again, Hiccup decides against it, and the Skrill is set free. When the baby dragons are forced to live on Dragon Island after nearly destroying Berk, the group learns they can't survive without a parent, so Stoick releases Thornado so he can take care of them, the two parting reluctantly. However, this is all part of their plan and Hiccup and Toothless escape their cell and rendezvous in Johann's Quarters, only to discover that Johann had moved the Dragon Eye to another location.
Despite their competition through the three challenges, Ruffnut decides to save Tuffnut instead of completing the final challenge, which Gruffnut reveals was the secret, fourth challenge: putting family above everything else. Jones Jack Thomas June 24, 2016 2016-06-24 With Dagur's information and a map of the location stolen by Johann, the riders send Snotlout and Gobber undercover with Berk's reluctantly lent gold to the hunters' latest dragon auction to rescue the dragons and cripple Viggo's business. The Deathsong is soon revealed to be alive and gains the chance to escape with the Riders thanks to Stormfly's new blinding light shot, and the Riders find him a more suitable home. While following the wounded Singetail to the same island, Fishlegs find a hatchery of Singetail eggs and realizes that the Flyers are breeding Singetails. Despite Gobber and Hiccup's insistence, he is unwilling to trust any new traders that come to Berk.
Hiccup reluctantly lets Viggo leave with the Buffalord in exchange for the cure, but as soon as his ship leaves it fights back forcing the Hunters to release it. Johann and Krogan realize Viggo's deception and a fight ensues, resulting in Viggo sustaining lethal injuries before rescuing the Skrill and reuniting with Hiccup. Hiccup is captured by everyone from two dim-witted brothers to Savage to the masked man from Viggo's auction, leading the riders and Stoick on a wild goose chase to find him. Snotlout and Ruffnut kidnap the Stinger and take it back to its pack when they and the rest of the riders are attacked by the other Speed Stingers who have similarly evolved. 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. The Berk forces are quickly put on the defensive and Krogan takes the chance to launch all his Dragon Flyers against them, which ultimately leaves them defenseless when Hiccup returns to turn the tide.
Dagur offers her the chance to join with the Berserkers, but she refuses. Hiccup, after fiddling around with the eye, finds that it's activated by the fire of any Dragon and works as a light projector showing him maps, writing and Dragons he's never seen. Astrid apologizes to Hiccup for her anger and behavior and the pair reconcile. The three must work together to repair the damage, overcome the rivalry between Hiccup and Snotlout and return home to Berk before they are captured by Alvin and the Outcasts. Intimidated by Viggo's intelligence, Hiccup decides to take a more cautious approach against him, and discovers upon investigating his ship that Viggo has challenged him to a game of strategy with Heather's life as the prize.