- Picking up just after the events in How to Train Your Dragon 2, Hiccup, Astrid, and company are called upon to assist the people of an earthquake-plagued island. But their lives are imperiled by a madman and an incredible new dragon who even Toothless—the alpha dragon—may not be able to control!
- Dragons writer, director, and producer Dean DeBlois is coplotting these stories.
- Stories tie in to the upcoming 2019 film.
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