TrollHunter (2010)

When bears are found dead in Norway, the students of the Volda University Thomas, Johanna and the cameraman Kalle decide to investigate. They stalk the trailer of the mysterious hunter Hans expecting to find an explanation for the killings. The reluctant Hans tries to flee from the youngsters, but he agrees that they film him in action provided they follow his orders. Sooner the trio of students learns that Hans is actually a troll hunter that works for a secret government agency. Further, several dangerous trolls have escaped from their territory and Hans is assigned to eliminate them.