We Are Family: Part II

S1, E20: After being tricked by Mildew and kidnapped by Alvin on the fake island of Night Furies, Hiccup and Toothless are imprisoned on Outcast Island. While Stoick, Astrid and the kids set out on a rescue mission, Hiccup must rescue Mildew (whom Alvin has also betrayed), reunite with Toothless, and face down dragons both trained and wild in a desperate attempt to escape the Outcasts.