You will Watch Dragons: Race to the Edge Season 3 Episode 6 online for free episodes with HQ / high quality. Stream cartoons Dragons: Race to the Edge S03E06 Gone Gustav Gone. Gustav visits the riders on ‘Dragon’s Edge’ saying he is now ready to become a dragon rider and be trained, as promised by Hiccup, to be a proper rider. After much delaying and ‘keeping Gustav busy’ by the riders, Gustav takes the ‘Dragon Eye’ to go on a treasure hunt. When the riders find out they make it clear to him that he is too immature to become a rider, and Gustav runs from the island in the night. Dagur captures him and Fanghook, whereby Gustav appears to become a part of their crew, with Gustav claiming he knows how to get Dagur the ‘Dragon Eye’. A trade take place with Gustav deciding to stay with Dagur, he later appears to double-cross Dagur returning the ‘Dragon Eye’ to Hiccup and saving himself in the process.