With Stoick a prisoner of the Berserkers, Hiccup is forced to ask Alvin for help. At the same time, the Screaming Death draws near...
Snotlout disobeys orders and is expelled from the academy. Alvin arrives in Berk to makeup, but no one trusts him.
When three adolescent Thunderdrums attack the village, only Stoick's Thornado can bring chaos to order.
The citizens of Berk must face a rogue species of dragon that steals all the metal it can find.
Toothless contracts the flu that is spreading throughout Berk.
With Hokfang and Stormfly fighting, the collection for the harvest is in danger.
When an ice storm hits Berk, Speed Stingers attack the citizens forcing them into hiding.
When the gang find an injured scauldron on Changewing island, they attempt to rescue it before further harm comes to it.
Gustav Larson fills in on Hookfang when his friend Snotlout doubts his future.
Tuffnut goes undercover to help the team rescue the Skrill from the Berserkers' grasp.
The riders find a frozen Skrill, a lightning powered dragon, and need to get it off Berk before the Dagur and the Berserkers find out about it.
While searching for dragon traps, Tuffnut falls into a trap with a forest fire bearing toward him. Fortunately, an old friend shows up to help.
Hiccup and friends discover that several islands have vanished, and that their old foe, the Screaming Death, is responsible.
Astrid sets out to confront the Flightmare, a dragon that shamed her family ten years ago.
When Hookfang's flame goes out, the riders must travel to Fireworm Island to reignite it.
When the village well runs dry, Hiccup and Toothless investigate. They soon discover a group of baby Whispering Deaths beneath Berk.
The team decides to practice, without their dragons, against wild ones and come across Dagur hunting dragons on the island.
After being left behind, Fishlegs and Meatlug overeat and discover that different combinations of stones cause Meatlug to produce different types of materials including glass, steel and magnets.
Certain that Alvin is planning an attack on Berk, Stoick institutes a ban on all dragon flying. Hiccup, certain that Alvin will be using his newfound dragon-training knowledge to bolster his attack, forms a secret “Dragon Flight Club” in order to train the kids to defend Berk against Alvin’s dragon army.moreless