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There is no Next Episode of DreamWorks Dragons planned.
Concerned that Alvin and the Outcast Tribe are planning an attack on Berk, Stoick institutes flight restrictions on the dragon academy. Certain that Alvin will also use his newfound dragon-training knowledge to bolster any attack, Hiccup forms a secret "Dragon Flight Club" in order to train the kids to defend Berk against a potential dragon army-not realizing that Stoick's flight ban was for everyone except Stoick himself. Alvin and the Outcasts then attack Berk, and while the riders are defending against the attack, Savage plant Whispering Death eggs in the caverns under Berk...
Fishlegs discovers that Meatlug can produce "Gronckle Iron", a lightweight but extremely strong metal. Because their slow speed had previously allowed an Outcast boat to escape, Fishlegs decides that producing Gronckle Iron is a more helpful task than flying with the other teens, until Meatlug ends up ingesting a magnetic rock, attracting all the metal in the village-including Hiccup's metal leg.
When Hiccup and the others go to Dragon Island to train their stealth and survival instincts without the help of their dragons, Hiccup reluctantly gets caught up in dragon-hunting with Dagur the Deranged, who is also on the island to find and kill Toothless in order to restore the honor of the Berserkers.
When the town's well runs dry, Hiccup and Toothless discover the group of baby Whispering Death dragons in the tunnels underneath the village planted there by Alvin and the Outcasts, and discover a new dragon subspecies, the Screaming Death. The teens must drive the Screaming Death and the Whispering Death hatchlings away from the village before they destroy Berk.
When Hookfang's flame goes out after Snotlout pushes his training too hard, the kids have to figure out how to reignite it with the burning heat of Fireworm dragons before it's too late, but not before discovering that Fireworms act similar to bees in a beehive, and they have an angry queen, too!
Every decade, Aurvandil's Fire arrives to Berk, inviting a ghostly dragon, the Flightmare, to the village. Astrid, with the help of Hiccup and Fishlegs, is determined to defeat this dragon, which seemingly "froze" her uncle with fear, in order to restore her family name. Meanwhile, Ruffnut and Tuffnut create a bunker at the Academy to hide from the Flightmare, allowing everyone in except Snotlout, instead demanding a superfluous amount of unusual tasks, such as bringing rainbow chickens, singing Terrible Terrors, and fish dressed like Stoick to mess around with him.
When the team has an argument about who is the best dragon trainer, a "competition" take place to see who is the best dragon trainer despite Hiccup the only member who keeps telling them that it is not a competition. They each receive a Terrible Terror and are given one day to train it and teach it tricks, such as head butting, controlled fire shooting, and some dog-like tricks. While wrapped up in trying to beat Snotlout, Fishlegs fails to notice that Meatlug caught Outcasts sneaking into Berk, which leads to her being captured!
When the nearby islands begin to disappear and the dragons that used to inhabit them begin migrating to Dragon Island, the teens discover that the cause of this is the Screaming Death, who has returned seeking vengeance. The Screaming Death happened to be digging shafts underneath the island that were large enough to cause the islands to collapse into the sea, forcing dragons to abandon their homes. The teens have to stop the Screaming Death before it causes Berk to collapse.
Barf and Belch are Tuffnut's only guard when he gets caught in an old dragon trap in the forest. Things go from bad to worse when Tuffnut is faced with not only a fully-grown Torch (the young Typhoomerang that the gang befriended in Season One), but also an incoming deadly forest fire that threatens him and both the dragons.
When the dragon riders discover a Skrill, a lightning-powered dragon revered by the Berserkers,that happens to be frozen in ice, they scramble to get it off Berk. But when the Skrill is thawed out and unleashed, Hiccup and Toothless are faced with a battle between both the Skrill and Dagur the Deranged's Berserker armada (also hunting the Skrill) which could prove to be more than Hiccup and Toothless can handle. During the battle, the twins witness Alvin in an Outcast ship capturing the Skrill...
When Alvin the Treacherous captures the Skrill, Hiccup, Ruffnut, and Tuffnut go undercover to discover that a truce is in the process of being formed between the Outcasts and the Berserkers to invade Berk with the Skrill as their weapon. Dagur is giving Alvin the support of his vast fleet in exchange for the Skrill, but the truce is uneasy. The trio must now flee to release the Skrill from their control before the truce can be settled. 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. Dagur then attempts to take on Hiccup and Toothless with the Skrill, but he doesn't have Hiccup or Alvin's experience with dragons and the dangerous Skrill proves more than either of them can handle. Hiccup and Toothless manage to lure the Skrill into a glacier, freezing it once again.
Snotlout becomes convinced he is dying having seen "The five signs of Valhalla", claiming that after seeing a singing tree, falling chickens, and sheep chasing him, etc, that he would die, and wants young Gustav to be his replacement including taking care of Hookfang in case he died. But when Snotlout "miraculously" recovers (the five signs he saw were really pranks played by Ruffnut and Tuffnut), he takes his dragon back, and Gustav decides to get a dragon of his own (named Fanghook) and join the academy… whether they want him to or not, especially as the Dragon Riders plan to stop Dagur the Deranged's new plan.
While on patrol for the Screaming Death, Hiccup, Toothless, Fishlegs and the twins discover an injured Scauldron on Changewing island. The Scauldron rebuffs their attempts for help, so no one but Ruffnut seems to calm it down. She trains the dragon and the gang are able to help it. Ruffnut sacrifices her long braids in order to finish the support for the wing before the Changewings get them.
After rescuing Trader Johann, Hiccup and Toothless return from a mission to find Berk mysteriously empty. They discover that the village has been overrun by Speed Stingers, a non-flying dragon that move at blindingly fast speeds and can paralyze their victims with their tails. The Speed Stingers have trekked across the frozen sea to Berk and driven everyone out of town. Now, Hiccup must find a way to drive the Speed Stinger horde away from Berk before their next raid.
Hiccup must mend fences between Astrid and Snotlout when Stormfly and Hookfang start fighting more ferociously than ever. Astrid and Snotlout must grudgingly work together to find the cause of the feud, if they want their dragons to stay in the academy. Meanwhile, Fishlegs discovers Dragon Root, which could end up affecting not just Stormfly and Hookfang, but all their dragons.
While gathering an eel for medicine for an Eel Pox epidemic on Berk, Toothless eats a red eel attacking Hiccup after he falls into eel infested waters. This causes Toothless to come down with the dragons' version of Eel Pox, skittish and uncontrollable fire power. To make things worse the ingredients needed to cure the illness are in Toothless' satchel and all but Fishlegs has been caught sick. With little time to lose, Hiccup and Fishlegs must find a way to cure Toothless and get the stuff for the cure back to Berk.
When Trader Johann delivers mass quantities of metal to Berk that came from Breakneck Bog, the island becomes infested with Smothering Smokebreaths, that steal the town's metal to build a new nest. With no metal, and especially no weapons to protect their village, Hiccup and the others must find a way to get rid of the rogue dragons, only to discover that the Smokebreaths' appearance was planned as an attack by Dagur the Deranged.
When three baby Thunderdrums follow Hiccup and Stoick back to Berk, the trio of Dragons prove to be a handful for the Dragon Academy to train. 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.
After Snotlout accidentally puts Astrid in a near-death situation, Hiccup suspends him from the academy for disobeying the rules one time too many. However after he and Hookfang are ambushed by the Screaming Death on Snotlout's secret island, "Snotland"', he is rescued by Alvin the Treacherous, who has returned to Berk, claiming he is there to make amends with the Vikings. Despite the fact that nobody trusts him, Alvin's warnings allow them to defeat Dagur's invasion, but before they can destroy Dagur he captures Stoick; Dagur flees back to Outcast Island with his captive, demanding Hiccup and Toothless in exchange for Stoick's life.
Hiccup is forced to work with Alvin in order to save his father from Dagur's wrath. But when Alvin and Mildew help him discover what the Screaming Death has been after all along, he comes up with a plan to end the war between the Outcasts and Berk, stop Dagur, get rid of the Screaming Death, and save Berk once and for all.