It is here that we will see great dragons, which increasingly allow ordinary people to draw nearer to him. The only known cure is a solution made from the saliva of a Buffalord, a dragon hunted to extinction centuries ago. After the group traps the leader dragon they realise how much danger the rest of the dragons are in when Changewings begin attacking them. Soon they get a stomach ache and return to Berk to get Meatlug checked by Gobber. When Flyers attack, Ruffnut rescues Wingnut and uses her newly learned Wingmaiden abilities to help repel the Flyers' attack. In trying to set the Seashocker free, it ends up being chased by a pack of Scauldrons, and Fishlegs, guilty over his trapping the Seashocker, goes to extremes to save it. This causes Stoick to reconsider allowing the dragons to roam freely on Berk.
Fishlegs manages to free the Quakens just as their poundings cause the island to sink and have them destroy the Hunters' stone base. Using copied notes from the Dragon Eye, the riders locate a living Buffalord, but it refuses to leave the island where it lives. 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. His obsession quickly lands him in trouble when he and Toothless are stranded on an island inhabited by the hunters and Toothless is incapacitated. Well, after the battle with uninvited guests always comes a time of fun and relaxation! 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. When the riders find out they make it clear to him that he is too immature to become a rider, Gustav runs from the island in the night. DreamWorks Dragons features the voice talents of , , , Julie Marcus, , , , and.
After finding her, the riders scour the beach and the wreck of the Reaper for clues on their whereabouts, but only find a new lens for the Dragon Eye that works with a Changewing's acid. 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. Meanwhile, Hiccup and Snotlout travel to Wingmaiden Island to escort Atali to the meeting, where Atali leaves her second-in-command, Minden, in charge of the island, though Minden is upset at not being allowed to attend the meeting as well. 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. Soon enough Hookfang is in deep trouble as his flame goes out, so it's a Race to Fireworm Island to help restore Hookfang's flame before it is too late. The three escape the island, but Hiccup is still not sure what to make of this old enemy turned ally.
When they return, the riders re-welcome Heather while offering their support and she and Astrid take the time to bond. Meanwhile, Stoick and Gobber, left in charge while the riders are away, lose Tuffnut's pet chicken and each try to replace it with a new one. While imprisoned, they reunite with Heather, who has now joined forces with her brother and is apparently working together with Ryker. The trio must now flee to release the Skrill from their control before the truce can be settled. 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.
Meanwhile, Hiccup and Snotlout travel to the island of the Screaming Death where, with help from its mother, they create suits of armor made from its shed scales that make them impervious to the hunters' arrows. The only solution is to bring Astrid to the Buffalord, but Viggo also arrives revealing he infected his own men to get the riders to lead him to the Buffalord. Later, it was discovered that Fishlegs was allergic to Gobber's ear wax which he has been using on Meatlug's saddle. However, Dagur betrays Alvin, claiming that because the Skrill is the Beserker's emblem, that they have full control over it, and gets rid of him. Hiccup and the dragon riders, thanks to Johann, band back together and track him down to a fog bank beyond their borders and discover a huge graveyard of ships filled with treasures that Dagur would use to build a new armada. Krogan is captured and executed by his employer, Drago Bludvist, for his failure in acquiring the egg and Drago begins to seek out a new Bewilderbeast. Dagur is giving Alvin the support of his vast fleet in exchange for the Skrill, but the truce is uneasy.
Astrid gains her sight back thanks to Gothi and she and Hiccup enjoy a perfect moment together, finally beginning their relationship. Using the baby Razorwhips, the Wingmaidens defeat Flyers. Mala attempts to retrieve the egg herself, but Hiccup and Fishlegs regain their synergy and realize the Fire Terrors are there to safely bring the egg to the nesting ground without human interference. 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. They eventually learn the Quaken's behavior was out of loneliness and defensive instinct, and allow it to remain and share the island with the Gronckles.
The island where the gold is stored turns out to be empty save for strange looking ruins, and the others are captured by Viggo while searching. Hiccup elects to nurse it back to health but Snotlout opts to leave it on account of its paralyzing abilities. Many recruits apply, including Gustav, Gothi, and Spitelout, but Hiccup takes notice of her overly harsh regimen and points out she wants her students to fail so she has a reason to stay on Berk and protect her family. Ruffnut sacrifices her long braids in order to finish the support for the wing before the Changewings get them. When he arrives, he realizes that Viggo is the one who sent the message and Viggo tells the story of his betrayal and asks for Hiccup's help.
After the twins throw everyone in the 'dungeon' they realise they need the other riders to stop the island becoming a pile of ash. 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. 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. When the riders find Ryker, he tells them that Viggo is setting them up and he can give them the Dragon Eye as the Berserkers are attacked by the Shell Fire, a giant sea dragon equipped with Hunter weaponry. At the same time, Gobber appears and warns Hiccup of an unpleasant change in Stoick back on Berk that is currently driving everyone crazy. Meanwhile, the baby's mother makes her way toward Berk to find her lost son. When Mildew is discovered responsible, he is forced to help Hiccup, Stoick, and Gobber find and capture a ferocious water dragon called the Scauldron in order to concoct an antidote before it is too late.