Set between the films Dragons and Dragons 2
After the peace with the dragons, the village of Beurk now has both dragons and Vikings, but the behavior of the Vikings remains the same, with the dragons disrupting village activities. Hiccup and Toothless must train the dragons with the help of their gang before they are banished, maintaining the balance in the new cohabitation.
At the Dragon Training Academy, Hiccup, Toothless, and the rest of the Viking teens are put to the test when they are confronted with new worlds harsher than Berk, new dragons that cannot all be trained, and new enemies who are looking for any reason to completely destroy the harmony between Vikings and Dragons.