Dragons

Hiccup, Ruffnut and Tuffnut must infiltrate Outcast Island and contend with the new alliance between Alvin and Dagur, who wield the fearsome power of their combined armada, along with the deadly Skrill.

Snotlout becomes convinced he is dying, and leaves Hookfang to Gustav. But when he "miraculously" recovers, Snotlout takes his dragon back, and Gustav decides to get a dragon of his own (named Fanghook) and join the academy… whether they want him or not.

Hiccup and co. discover an injured Scauldron on the shores of Changewing Island. The kids must heal the dragon and return him safely to the ocean, before he falls victim to the elements, as well as the territorial Changewings.

Hiccup and Toothless return from a mission to find Berk mysteriously empty. They discover that the village has been overrun by Speed Stingers, a venomous non‐flying dragon that has trekked across the frozen sea to Berk.

Hiccup must mend fences between Astrid and Snotlout when Stormfly and Hookfang start fighting to the death. Astrid and Snotlout must grudgingly work together to find the cause of the feud, if they want their dragons to stay in the academy.

While gathering medicine for an Eel Pox epidemic on Berk, Toothless accidentally eats an eel, which causes him to become paranoid, skittish and possibly dangerous.

The mysterious theft of metal objects all over Berk reveals the presence of marauding Smokebreaths. Hiccup and Toothless soon discover that these dragons are the work of Dagur, in a plot to render Berk defenseless.

Hiccup and Stoick, along with Toothless and Thornado, discover an orphaned trio of young Thunderdrums. The dragons follow them back to Berk, and it soon falls to Thornado to take the unruly dragons under his wing.

Fed up with Snotlout's disrespect, Hiccup suspends him from the academy. When Snotlout leaves Berk, he encounters both the Screaming Death, and Alvin! The Outcast is brought back to Berk, but his motives are unclear.

Hiccup cautiously accepts Alvin's help on a mission to rescue Stoick from Dagur's clutches. The Berkians, the Berserkers and the Screaming Death all converge on Outcast Island, for a confrontation that may decide the fate of the archipelago.