ISBN-13: 9780340999110 / Angielski / Miękka / 2010 / 272 str.
Someone has stolen the Fire stone. Now the volcano on Volcano Island has become active and the tremors are hatching the eggs of the Exterminator dragons Can Hiccup stop the Volcano from erupting, and save the Tribes from being wiped out by the terrible sword-claws of the Exterminators?