Allan is a human boy who has a Worm as his monster partner. He lives in a treehouse where the Morx Forest becomes the Tagi Jungle. When Genki and his friends first meet Allan he wants to join Moo and agrees to help the Seed Sisters capture Genki's team until they betray him and kill his Worm. After switching sides and helping Genki defeat the evil Weed, he decides that Moo's way is not the right way, and his new-found friends give him a mystery disc that they found, allowing him to obtain a new baby Worm.