'Deep in the heart of every forest there is a place which is greener and quieter than anywhere else. In this rainforest, that place is called FernGully.
FernGully is a magical place, the home of rainforest fairies, elves and animals. But one morning, Crysta, a young fairy, finds that things have changed; the frogs are croaking that Hexxus, the forest's ancient enemy, is changing the weather.
Soon Crysta finds out that there are humans at Mount Warning, and that they have released Hexxus from his long imprisonment in a tree at the foot of the mountain. This means that FernGully is facing destruction!
Crysta, her elf friend, Pips, Batty Koda, a brain-fried bat, and Zak, a boy she finds in the forest and brings to FernGully, join forces with Magi Lune, the keeper of the Old Powers, to save FernGully.' (Source: Back cover)