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Hiccup grows wary when Gruffnut arrives on the twins' 19th birthday to administer a Thorston coming-of-age ritual involving three dangerous challenges.
First Air Date : Jun 26, 2015
Last Air date : Feb 16, 2018
Episode : 78 Episode
Season : 6 Season
Runtime: 23:14 minutes
Studio: Netflix
Country: United States of America
Crew: