The Final Chapter
When Hiccup discovers Toothless isn't the only Night Fury, he must seek "The Hidden World", a secret Dragon Utopia before a hired tyrant named Grimmel finds it first.
As Hiccup fulfills his dream of creating a peaceful dragon utopia, Toothless' discovery of an untamed, elusive mate draws the Night Fury away. When danger mounts at home and Hiccup's reign as village chief is tested, both dragon and rider must make impossible decisions to save their kind.
When Toothless gets drawn away by the sudden and inexplicable appearance of female Light Fury and a new threat finds their way into Hiccup's crowded dragon utopia, both human and dragon alike are prompted to begin a search for the mythical ancestral home of dragons: a hidden world thought to exist only in myth. A tale of friendship, fate, and ultimately letting go.
The Vikings continue to rescue captured dragons in order to bring them to Berk and its bustling dragon and human utopia. Their efforts have resulted in the island becoming overpopulated with dragons. In a response to the overcrowding, Hiccup desires to find the "Hidden World", a safe haven for dragons spoken of by his late father Stoick. Meanwhile Toothless finds his perfect date and that was this Light Fury who was held captive by warlords and she was given to infamous dragon hunter Grimmel the Grisly (Night Fury Killer) as bait for him to capture Toothless himself for the warlords' use as an alpha. But the Light Fury falls in love with Toothless (Night Fury) and teaches him how to use his power.
Hiccup fulfills his dreams of creating a dragon utopia and rules it alongside Astrid. When the sudden appearance of female Light Fury coincides with the darkest threat their village has ever faced, Hiccup and Toothless must leave the only home they've known and journey to find the mythical Hidden World before a hired tyrant named Grimmel finds it first. As their true destines are revealed, dragon and rider will fight together-to the very ends of the Earth-to protect everything they've grown to treasure.