DreamWorks Dragons

It has been 3 years since the war with the Berserkers and Hiccup and his friends are enjoying life. But, when Dagur the Deranged escapes from the prison on Outcast Island, he decides to take his revenge on Hiccup. 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. 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. Dagur fires a boulder, from a catapult, onto The Reaper causing the ship to sink, leaving Hiccup with a choice: Retrieve the device he found from Dagur, or save his friends from certain death.

Hiccup goes to save the other riders, but discovers that cage is 'Dragon-Proof'. After much effort they finally get it open and Hiccup is able to retrieve the device from a distracted Dagur. Back on Berk, Hiccup asks Gobber and Gothi about the device which he dubs 'The Dragon Eye' Gothi tells them that the key to unlocking the 'Dragon Eye' is a tooth from the Snow Wraith (A Strike class Dragon that detects body heat as a form of sight). The riders and Gothi travel to Glacier Island to retrieve the tooth. Meanwhile, Gobber takes Gothi's place as the village healer, however he is far from good at it. 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. He then quotes, "This changes ... everything!"

The riders start to explore the maps they have seen on the 'Dragon Eye' and go far from Berk, to the point that they decide that they need an island base just for themselves. 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. In an attempt to free their dragons all of the group apart from Hiccup get trapped by the dragon. 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.

The riders finally find an island that will be perfect for an outpost. Unknown to them, a new species of dragon living on the Island, known as the 'Night Terrors', lives there too, and they ambush and scare Tuffnut. After the group traps the leader dragon they realise how much danger the rest of the dragons are in when Changewings begin attacking them. 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. The dragon riders fight off the Changewings and free the leader. The leader then befriends the riders as the natural protector of them and the island.

Back on Berk Stoick has asked the riders to deal with a Scauldron which is in the waters around Berk. It becomes apparent that Fishlegs has become allergic to something. Gothi hypnotizes Fishlegs in an attempt to rid him of the allergy, however, due to Snotlout talking during the hypnosis, Fishlegs thinks he is the all mighty, all-conquering, warrior viking called Thor Bonecrusher who is loved by everyone and has no fear of anything. In Thor's attempt to tame the Scauldron, Meatlug comes under attack, and the fear for Meatlug's safety is the only thing to snap Fishlegs out of the hypnosis. Later, it was discovered that Fishlegs was allergic to Gobber's ear wax which he has been using on Meatlug's saddle.

Gustav visits the riders on Dragon's Edge saying he is now ready to be trained, as promised by Hiccup, to be a proper dragon rider. After much delaying and 'keeping Gustav busy' by the riders, Gustav takes the Dragon Eye to go on a treasure hunt. 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. Dagur captures him and Fanghook, whereby Gustav appears to become a part of their crew claiming he knows how to get Dagur the Dragon Eye. A trade takes place, but Gustav decides to stay with Dagur. He later double-crosses Dagur returning the Dragon Eye to Hiccup and saving both of them in the process. Hiccup also discovers a new series of lenses for the 'Dragon Eye'.

It becomes apparent that the twins are the rightful and lawful owners of the island on which the riders have made base. They enforce their royalty rights immediately getting the other riders doing meaningless and annoying tasks. During all this Fireworm dragons start arriving on the island as part of their migration; however being Fireworm dragons they start burning the island down. 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 agree that all the group are equal owners to the island and they in turn agree to help. It is only the Night Terrors forming the shape of the Fireworm Queen that gets the Fireworms to leave the island.

The riders are tracking down an elusive Rumblehorn that is going around their island base and scaring all the dragons away. At the same time, Gobber appears and warns Hiccup of an unpleasant change in Stoick back on Berk that is currently driving everyone crazy. Hiccup enlists the aid of his father in tracking down the Rumblehorn, but Stoick comes to question its intentions upon discovering it. They eventually learn the Rumblehorn has been attempting to warn everyone of an approaching tsunami and chase them off before the wave would wipe them all out. With the aid of Stoick and the Rumblehorn, the riders create a wall to block the wave and protect the island. In the end it was revealed that Stoick missed Thornado but in turn comes to bond with the Rumblehorn, who becomes his new dragon Skullcrusher.

Experimenting with the Dragon Eye allows Fishlegs to find the location of Dark Deep, the ancestral home island of the Gronckles. Upon landing there, they find the island has been taken over by a massive new dragon called the Catastrophic Quaken. It's dangerous behavior forces the other Gronckles to leave and seek refuge on Dragons' Edge, much to everyone's dismay. Determined to win back Dark Deep for the Gronckles, Fishlegs allows Snotlout to train him in fighting dirty behind Hiccup's back in order to beat the Quaken and drive it off, but quickly find themselves outmatched once they confront it directly. 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.

While gathering supplies, the riders hear of a rogue dragon rider attacking ships and stealing their provisions. They identify the rider's dragon with the Dragon Eye as a Razorwhip and pursue it to a remote island. One by one the riders are picked off by the rogue until Hiccup and Toothless chase her down and she reveals herself to be Heather, with her new dragon Windshear. The group mostly welcomes her back with open arms, but Hiccup is suspicious of her new, more aggressive behavior. Following her to Trader Johan's ship, Hiccup interrogates Johan and learns that Heather's island was attacked and her parents killed by Dagur, who she pursues for revenge while stealing supplies to help rebuild. Heather meanwhile tracks down Dagur alone but is captured by his new armada.

Hiccup manages to rescue Heather, and though she is still determined to take revenge, Hiccup persuades her to leave it for another day. On the way back to Dragons' Edge, Heather reveals that the parents she lost were adoptive, and all she has to remember her birth father is an old horn. When they return, the riders re-welcome Heather while offering their support and she and Astrid take the time to bond. 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. They manage to successfully capture Dagur, but Hiccup intervenes before Heather can kill him, revealing that her horn was a gift from Stoick to Oswald the Agreeable, her father, meaning that Dagur is her brother. Dagur offers her the chance to join with the Berserkers, but she refuses. In the end, Heather decides to leave, saying she has much she needs to figure out.

Hiccup is testing a prototype wingsuit when the riders come across an injured adolescent Speed Stinger. Hiccup elects to nurse it back to health but Snotlout opts to leave it on account of its paralyzing abilities. The riders take it back and nurse its leg to health when Fishlegs discovers the Stinger has gained webbed feet as a result of evolution. 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. The young Speed Stinger decides to help the riders chase off the pack, and with its help and Hiccup's new wingsuit, drive the Stingers back across the sea. The young Stinger is torn between its pack and the riders, but Hiccup convinces it to go back with its family.

The riders are in the middle of training when Hookfang begins behaving strangely after hearing a mysterious call. Following him, the riders find that he has mated with a female Monstrous Nightmare. Convinced that Hookfang has reverted to his old feral nature, Snotlout decides to resign from being a dragon rider. When he returns to say goodbye, however, he discovers that in reality, Hookfang has been helping the female protect her eggs from a Titan Wing Monstrous Nightmare. Snotlout and Hookfang join forces to gain dominance over the Titan Wing and drive it away, saving the eggs and their mother.