Dan Greenburg

When his friend Spencer, the class genius, spends the night, he and Zack discover how to leave their bodies and travel around New York City, but they have one problem--how to get back inside themselves.

When Zack uses a magic box from Tibet to produce a duplicate of himself, he finds that he has created more problems than he has solved.

Zack's discovery of a parallel universe causes him a few tense moments when his parallel self, Zeke, steals his retainer, forcing him to go into Newer York to get it back.

Zack starts turning into a cat when the spirit of an ancient Egyptian cat goddess is accidentally transferred into his body during a class field trip.

Ten-and-a-half-year-old Zack finds out how spooky the natural history museum really is when he gets trapped there at night.

Having been reunited with their zombie father only to have him turn into a vampire after drinking an experimental elixir of life, the ten-year-old Shluffmuffin twins continue to try to elude the giant ants who want to enslave all humans.

When Zack goes to a store to buy a baseball card, he finds himself face-to-face with his future son who has traveled back in time.

When Zack is given the chance to swim with dolphins on a trip to Florida, he dives right in. But before long, Zack is surprised to find that the dolphins are trying to tell him something ? and even more surprised that he can understand and talk to them! There's definitely something fishy going on here! Could it be genuine animal communication? And can Zack and his new friends get their signals straight and salvage an old sunken ship filled with treasure?...

After the Mandible sisters kidnap his sister Cheyenne, Wally seeks the help of a group of orphans and his vampire father.

Followed by an assassin and her poisonous snakes, ten-year-old twins Wally and Cheyenne Shluffmuffin try to get from their Ohio home to the FBI training facility in Quantico, Virginia, to get help in freeing human hostages from the onts.