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Nickelodeon has unveiled the first official trailer for the film Hey Arnold: The Jungle Movie. This new installment to the story line is the first addition in the past 13 years. When he learns news that his long lost parents may be in the fictional country San Lorenzo, Arnold sets out on a mission along with the entire gang to find his them. Hey Arnold: The Jungle Movie will premiere this Thanksgiving on Nickelodeon. Take a look at the full trailer debuted at Comic-Con above.