Reluctant hero Hiccup Horrendous Haddock III must find a potato, rare and impossible to find in his world, to cure his best friend Fishlegs of a deadly disease.

In exile, and hunted by dragons and humans alike, can Hiccup the Viking find the dragon's jewel and save the world from destruction?

Hiccup is in hiding in the Murderous Mountains with the Company of the Dragonmark, but he is determined to become King of the Wilderwest by defeating the witch's Vampire Spydragons and steal back the King's Things from Alvin the Treacherous.

Now chief and ruler of Berk alongside Astrid, Hiccup has created a gloriously chaotic dragon utopia. When the sudden appearance of female Light Fury coincides with the darkest threat their village has ever faced, Hiccup and Toothless must leave the only home they've known, and journey to a hidden world thought only to exist in myth. As their true destines are revealed, dragon and rider will fight together-to the very ends of the Earth-to protect everything...

Hiccup is a Viking teenager who aspires to hunt dragons, but doesn't exactly fit in with his tribe's longstanding tradition of heroic dragon slayers. His world gets turned upside down when he encounters a dragon that challenges him and his fellow Vikings to see the world from an entirely different point of view.