Episode Title:Guardians of Vanaheim.Episode Description:Learning that several Flyers have followed her to Vanaheim, Heather arrives on Berk and informs the Riders. Hiccup, still worried about his father, is reluctant to leave Stoick alone and go to Vanaheim. Stoick momentarily wakes up to help him make the right choice. Before leaving, Alvin arrives with reinforcements to help keep Berk safe while Stoick is recovering. After arriving, they find the Sentinels seemingly dead and interrogate a remaining Flyer, who reveals the rest of the Flyers are on their way to inform Johann of Vanaheim's location. Hiccup, Astrid and Snotlout pursue the Flyers, but are forced to retreat into a ship and devise a plan. Using a supply of bolas from the ship, they lure the Flyers into a storm, causing the Flyers to be struck by lightning. Back on Vanaheim, Fishlegs looks through Oswald's hut for any information on the Sentinels and discovers they are not dead, but merely in a state of hibernation. Discovering that heat helps speed the hibernation process, Fishlegs and the twins use their dragons to restore the Sentinels while the twins end up finding a Dragon Eye lens while ransacking Oswald's hut. Johann also ends up attaining a fifth lens after capturing Gruffnut.