It's A Troll Hunt!

When a messenger bat arrives at the RSPCB, boy-werewolf Ulf receives a warning that beasts are in trouble in the wild. Unaware of the danger he is facing, Ulf soon uncovers foul play: A rare colony of trolls is being smoked out from their caves to be used as game in an evil beast-hunting preserve. It's up to Ulf to save the day!