Five years have passed since Hiccup and Raya brought peace to Kumandra and recognised feelings for each other. But their happy life with Toothless, Sisu and their friends is interrupted by the invasion of Hiccup's former clan and all their allies who seek to destroy dragons forever. Together they must battle their foes and Hiccup must face the past he left behind.
Hiccup and his dragon Toothless ran away from Berk and found a group known as Dragon Hunters. They managed to hurt their business without being found or hurt themselves for a while, but their work got the attention of their leader, Krogan, who set off to stop them. During one of their fights, they found Kumandra and ran into a princess named Raya who's trying to save the world.
When Ethan and his friends are blown far off course in a massive storm, they find themselves in a strange land called Kumandra. But when his dragon Amy comes into contact with the Dragon Gem, it turns her into a human. Now it's up to them and their new friends to unravel the mystery of Amy's strange connection to the gem and to solve the important question: can she be turned back?
Hiccup and Toothless's search for a place to call home takes them to the land of Kumandra, home to tribes of people who have lived in distain of one another since its dragons sacrificed themselves to save humanity. To help the land, they team up with lone warrior Raya and the Last Dragon Sisu. (Hiccup x Raya)