Episode Title:Enemy of my Enemy.Episode Description:Months have passed since the riders' defeat at the hands of Viggo and Hiccup is determined to reclaim the Dragon Eye. His obsession quickly lands him in trouble when he and Toothless are stranded on an island inhabited by the hunters and Toothless is incapacitated. Help comes from an unlikely source when Dagur appears and guides Hiccup and Toothless to his hideout, where he explains that he has been living in exile since leaving the hunters and claims to be reformed. Though highly reluctant, Hiccup works together with Dagur to cure Toothless but the two are captured and Dagur appears to abandon Hiccup, but later comes back riding Toothless to save him. The three escape the island, but Hiccup is still not sure what to make of this old enemy turned ally.