Zack feels that a supernatural force is at work in his apartment when he encounters floating television sets, pancakes that flip by themselves, and a ghost named Wanda.

What I wanted was a cute little kitten. Instead, I got a tough tomcat that talks. And that's not all! He says he's my Great-Grandpa Julius and he needs my help. And messy litter box or not, family is family!

After an electrifying experiment in science class gives Zack a shock, he realizes that he can read other people's minds.

While Zack is being treated by Dr. Jekyll, his new orthodontist, the doctor undergoes a strange transformation into a growling monster.

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.

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.

Late one night when ten-year-old Zack hears strains of "Heartbreak Hotel" coming from the refrigerator, he discovers the possibility that Elvis lives on as a turnip.

When Zack accidentally drinks the invisible ink that is one of Spencer's experiments, he worries about missing his only chance to get his picture in the paper, if the new flavor he and Spencer invented wins the local Len and Larry's Ice Cream contest.

In Central Park, Zack and his dad encounter an alien who has lost his spaceship, which has been towed because it was illegally parked.

A strange trip through a metal detector causes Zack's eighty-eight year old Grandma Leah to get younger and younger.