Hiccup Horrendous Haddock III must rescue his best friend, Fishlegs, from the deadly disease, Vorpentitis. The only cure is rare and almost impossible to find - a potato. But where will Hiccup find such a thing? He'll have to dodge the terrible Sharkworms, battle Doomfangs, and outwit crazy Hooligans if he's going to be a hero again.
Read by David Tennant.