Episode Title:Appetite for Destruction.Episode Description:When nearby islands begin to disappear and the dragons that used to inhabit them begin migrating to Dragon Island, the teens discover that the cause of this is the Screaming Death, who has returned. The Screaming Death happened to be digging shafts underneath the islands that were large enough to cause the islands to collapse into the sea, forcing dragons to abandon their homes. The teens have to stop the Screaming Death before it reaches Berk.