The Nightmare Machine / Whitman, John

Hologram Fun World is a theme park visited by families from all across the galaxy. One of the park's attractions is called the Nightmare Machine. It scans your brain, then shows you your worst fears in holographic form. It's not real, so it's fun--right? Zak and Tash soon find out that nightmares can come true.

A visit to Hologram Fun World turns deadly when Tash and Zak discover that the Nightmare Machine--a game that scans the brain for nightmares then reveals them in holographic form--is part of a larger plot to take over the galaxy.

On the planet Fun World, where computer-generated holograms create both entertainment and terror, Zak and Tash discover that some of the scary illusions may be real and dangerous.