Maria Bolme

The world's strongest (and kindest) bear has to save his kidnapped grandmother when the town's former thieves band together to steal everything they can, led by the dastardly fox Reinard.

Bamse's friends go on a quest to find the Thunderbell, the ingredient that makes Bamse strong. Meanwhile, Reinard pretends to be a good guy to supplant Bamse as the hero of the town and win the affections of Mickelina.