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

• Bamse Förlaget
• SVT
• Peter Haber
• Morgan Alling
• Steve Kratz
• Tomas Bolme
• Rolf Lydahl
• Bianca Kronlöf
• Maria Bolme
• Andreas Rothlin-Svensson