When his best friend Fishlegs is stricken with Vorpentitis, Hiccup Horrendous Haddock III must outwit Sharkworms, Doomfangs, and Hooligans to find a potato--the rare cure for this deadly disease.
Recounts the further escapades of Hiccup Horrendous Haddock the Third as he continues his Viking training during which he escapes from a boatload of Roman soldiers and searches for his kidnapped dragon.
Chronicles the adventures and misadventures of Hiccup Horrendous Haddock the Third as he tries to pass the important initiation test of his Viking clan, the Tribe of the Hairy Hooligans, by catching and training a dragon.