As the Disney Fantasy joins the cruise fleet, a special treat is in store for guests aboard its inaugural sail from Cape Canaveral to Los Angeles: the Disney Host Interactive teenage guides will be part of the Fantasy crew.

Finn, Maybeck, Charlene, Willa, and Philby are to attend the cruise as celebrity guests, and to perform a ribbon cutting for the DHI server to go live. The Fantasy is now the most advanced cruise ship in the world.

But all is not right belowdecks. Strange things are happening. Unexplained phenomena. Only the Kingdom Keepers know the truth behind their invitation: nearly every Disney villain is represented onboard the new ship: whether on its decks or in its theaters. It's believed the Overtakers have infiltrated the cast and are "stowaways." Worse: it is believed they have stolen an important journal that once belonged to Walt Disney himself—Finn has been having dreams about this—and that some kind of mission is planned.

Five young teens find themselves pitted against Disney villains and witches that threaten both the future of Walt Disney World and the stability of the world outside its walls.