The Island

as Hiccup and Fishlegs are on their way back to dragons edge after searching Lycanwing Island but see that their is a giant Island that is just south of Lycanwing Island that has what seems to be a volcano moving around it in circles so after getting back to Dragons Edge and talking sense into Tuffnut the next day the Dragon riders all go out to the Island to see what lurks on this Island...or at least who lurks on the Island