Dad is ready to hand over the responsibility of the tribe leader to Hiccup, but Hiccup is not ready at this time. He soars into the sky with Toothless every day and explores new islands.
One day his girlfriend Astrid went with him on an expedition to a new island, where they encountered the dragon hunter, Erret, who believed they were the dragon knights who destroyed his fort, and said he was with the dragon master. Dreg teamed up to hunt various dragons.
After escaping, Hiccup returned to the tribe to tell his father the news. His father was very nervous and ordered the entire tribe to be in martial law and defense. Stop any flight. His father told him that Dreg had controlled the dragon clan to destroy a large number of tribes, and they were the only surviving ones. Hiccup thinks Dreg just doesn't understand that white dragons can live together peacefully, and he thinks he can persuade Dreg to keep the peace. He went looking for it despite his father's dissuasion, and Astrid followed.
They found the dragon hunter, and asked the dragon hunter to take them to see Dreg. At this time, they were worried that their friends would start a melee with the dragon hunter because they were worried that they would come to find them. During the melee, Hiccup got separated from everyone, met the Dragon Knight, fought and fell into the sea.
Hiccup and Toothless were taken to a cave by the Dragon Knight, where they unexpectedly discovered that the Dragon Knight was his long-lost mother. Back then, the mother was also in conflict with the father when she was looking for a way to live in peace with the dragon, and because of letting go. A dragon brought disaster to the village.
Under the friction with her father and the guilt of bringing disaster to the village, the mother left the tribe alone, domesticated a dragon king ice-spraying dragon here, and established a wonderful dragon paradise. Mother told Hiccup that dragons have a characteristic, they will automatically surrender to their dragon king, including the new Toothless, only the baby dragon completely ignores this.
The father who came to look for met Hiccup's little friends and asked them to return to the tribe as soon as possible. He and his partners continued to search for Hiccup.
The little friends were not willing to go back like this. They hijacked the dragon hunters and took them into Dreg's territory, where there are many warships and heavily armed dragon teams. The little friends were unfortunately captured. When Dragon Hunt was about to be executed by Dreg, Xiaolong protected him. When they were dragged to the deck to execute the execution, they all resisted and escaped from Dreg's territory.
Hiccup's father also came to Hiccup's mother's territory during the search process. The husband and wife reunited and the family was happy.
The good times didn't last long, and Dreg's dragon team found and came to this dragon paradise. At the beginning of the war, the mother drove the dragon king to win a small victory, but at this time Dreg also mobilized his dragon king to participate in the battle. The good dragon king lost to the evil dragon king. Many dragons began to surrender to the new dragon king under the induction of the new dragon king. Even Toothless can't escape the dragon's grip, attacking Hiccup, and in a time of crisis, Hiccup's father sacrificed his life to protect his son.
Events like this accelerate Hiccup's growth, and after his father's funeral, he and his friends tame the uncontrolled baby dragons for the next fight.
Hiccup has now become Dreg's mount. During the battle, under the constant reminder of Hiccup, Hiccup finally got rid of the Dragon King's control, and at a critical moment, he broke out a small universe to save Hiccup and defeated the dragon. Become a new generation dragon king. Hiccup has also grown into a competent tribal leader.
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