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The duration of How to Train Your Dragon - film - is 1.63 hours.
Its not a sequel or a film...its just a short film that is in the DVD and Blue-Ray of How to Train Your Dragon.
Son of the Dragon - film - was created on 2008-04-02.
hideous zippleback is a two headed dragon from the film 'how to train your dragon'
The book, 2003. The film, 2010. There are a number of other adaptations.