You are going to Watch Dragons: Riders of Berk Episode 15 online free episodes with HQ / high quality. Stream cartoons Dragons: Riders of Berk Episode 15 Online Twinsanity. The gang try to preserve traditions in order to maintain peace between Berk and the Berserkers. But when Ruffnut and Tuffnut begin to fight, they left their dragon, Barf and Belch, out of control. The Viking youths must bring the twins back together to control their dragon and avoid exposing their dragon-training secrets to Dagur the Deranged.