‘How to Train Your Dragon: The Hidden World’ 4K Ultra HD Blu-ray Cover Art By admin On 2019-04-02 In Cover Art Release date: May 21, 2019 4kCover Arthow to train your dragon Previous ‘Batman vs. Teenage Mutant Ninja Turtles’ 4K Ultra HD Blu-ray Cover Art Next ‘Batman’ 4K Ultra HD Blu-ray Cover Art