Kingdom Keepers (7 Book Series)

From Book 1: In this fantastical thriller, five young teens tapped as models for theme park "guides" 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. Using a cutting-edge technology called DHI--which stands for both Disney Host Interactive and Daylight Hologram Imaging--Finn Whitman, an Orlando teen, and four other kids are transformed into hologram projections that guide guests through the park. The new technology turns out, however, to have unexpected effects that are both thrilling and scary.
Includes a preview chapter from Kingdom Keepers II - Disney at Dawn!