The golden age of the Vikings is coming to an end, Scandinavia has become uninhabitable; thousands of Vikings die of plague, famine, and starvation. And so, what's left of the Viking people have rallied to Hiccup Horrendous Haddock III, the greatest hero of their time to lead them into a new land where the Viking people can endure. With this new burden, Hiccup must ensure his bloodline is secured, he'll need heirs to carry on the name Haddock long after he's dust and bone. And so, he will devise a harem that consist of women he's familiar with, women who are not Viking, and even women beyond Scandinavia. Hiccup will now embark on an epic quest of ensuring the survival of the Viking people and of sexual exploits, this will undoubtedly be the greatest chapter of his life.

Snotlout Jorgenson and his lackeys do the unthinkable and assassinate Stoick the Vast and frame Hiccup for the crime, thereby banishing the heir of Berk from his home. Hiccup is sent to Outcast island and meets Alvin the Treacherous and his hordes, but the Outcasts soon learn that Hiccup has a gift. The ability to tame dragons. Hiccup tames a Night Fury with all the Outcasts watching, and with that, they all vanished without a trace. The boy finds the most ruthless and most bloodthirsty Vikings in the Archipelago for one goal. Conquest. Hiccup's army of Vikings and dragons invade Europe and their goal is to become the most infamous and legendary Vikings in history, and Hiccup himself will prove to the world he's made himself strong and becomes a conquer. Hiccup Horrendous Haddock III will become 'Hiccup the Accused.'

Hiccup Haddock was branded as an outlaw for befriending a dragon, now he's out in the world and offers his services as a dragon rider and warrior to those who can pay a handsome price. When the disgraced Viking heir and his Night Fury settle in Germany, it's here where Hiccup stumbles upon the Kingdom of Corona, whose rulers had lost their only child at her infancy. With King Frederic and Queen Arianna willing to pay any price to have their daughter returned to them, Hiccup decides to find the lost princess and then move on from Corona and Germany. However, when Hiccup meets the lost princess, Rapunzel, he's not prepared for her to turn his world upside down in the best ways possible.