Hexxus

Hexxus (voiced by Tim Curry) is the main villain of Jaden Goes to Ferngully: The Last Rainforest. He is the anicent spirit of destruction, who was imprisoned inside a tree years ago. But when humans cut it down with their tree leveler, Hexxus was released, and wanted revenge on Ferngully. He tricked the humans into heading into the direction of Ferngully, and gained power from the pollution the machine created. During a battle, after a good human named Zak shut down the leveler, Hexxus lost his power for a moment until he became a giant skeletal monster made of oil. A fiary named Crysta stopped Hexxus by grwoing a seed inside of him into a tree, imprisoning him again.

Trivia

 * Hexxus will return for revenge in Jaden's Adventures of Fantasmic!