Dragons

The Chief invokes a flying ban on all dragons, so Hiccup and the gang start a secret club to prepare for the Outcast offensive and practise during the night. Also, Fishlegs is revealed to be afraid of the dark.

When Meatlug accidentally ingests magnetic rocks, she becomes magnetic herself and attracts all the metal in the village, including Hiccup's metal leg. Ultimately, she is able to help the kids win a battle against the Outcasts.

The kids go on a dragon survival training mission to Dragon Island, where they encounter Dagur, the Berserker Chief, who has become obsessed with hunting Toothless, the Night Fury.

Hiccup discovers that the town's water shortage has been caused by the Outcasts' plan to hide Whispering Death eggs under Berk. The eggs soon hatch in the tunnel underneath the island and threaten the villagers.

Hook tooth needs help, he is exhausted and urgently needs new fireworms and they are not on the island. Only a honeycomb on Fireworm Island can save his life, but the only issue is, it has been stolen.

Orendel's fire shines in the sky every ten years, but a dragon also appears. Meanwhile, uncle Finn has failed to prevent the dragon from destroying the village several times, and Astrid takes on the Herculean task.