When Dagur the Deranged captures Gustav, it's up to Hiccup and the Dragon Riders to get him back.
Accident-prone Gustav Larson comes to the outpost (Dragon's Edge) to join the Dragon Riders, but after getting chewed out by Hiccup for almost losing the Dragon Eye, he leaves, only to be captured by Dagur's men. Finding better treatment under Dagur, Gustav allies himself with the known villain in a kidnapping ploy against Hiccup, which could constitute an unforgivable act.—statmanjeff
Gustav Larson, comes to Dragons Edge claiming he is ready to be a Dragon Rider. He has destroyed or messed something up with the riders. H Gustav finds ths Drayon eye, and goes to an unstable island, whrre he almost dies. Hiccup caught him in time. Hiccup gets mad and yells at him. Gustav leaves and gets captured by Dagur
Gustav Larson, comes to Dragons Edge claiming he is ready to be a Dragon Rider. He has destroyed or messed something up with the riders. H Gustav finds ths Dragon eye, and goes to an unstable island, whrre he almost dies. Hiccup caught him in time. Hiccup gets mad and yells at him. Gustav leaves and gets captured by Dagur