The gang goes on a trip to check on Velma's younger sister, Madelyn. She's been studying stage magic at the Whirlen Merlin Magic Academy, where apparently there have been sightings of a giant griffin. The gang decides to investigate.

A blue harvest moon will rise, allowing the fairies to use a precious moonstone to restore the Pixie Dust Tree, the source of all their magic. But when Tinker Bell accidentally puts all of Pixie Hollow in jeopardy, she must venture out across the sea on a secret quest to set things right.