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Jörmungandr (How to Train Your Dragon)
The Jörmungandr is the overarching antagonist of the TV series, Dragons: The Nine Realms, serving as the overarching antagonist of Seasons 1 to 7 and the main antagonist of Season 8. It is the apex predator to all dragons who was locked away by Hiccup Haddock until being released by Thunder. It is also Tom Kullersen and Thunder's arch-nemesis.