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Hiccup, Toothless, and the rest of the dragon riders encounter two deadly, yet mysteriously linked, threats: One is an island consumed by Dragonvine--an uncontrollable force of nature that's poisonous to humans and deadly to dragons. The other is an all-new, all-terrifying dragon species--the web-spitting Silkspanners!
Writer, director, and producer Dean DeBlois is coplotting these stories.
Stories tie in to the upcoming film.
Note: This story takes place shorty after How To Train Your Dragon 2.