Dan Greenburg

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!

When Zack goes to Florida to visit Mel & Shirley's Wonderful World of Dolphins, he is surprised to discover that he can understand and speak to dolphins, which enables him to solve a kidnapping.

After falling through his computer screen, Zack travels back in time to a school in 999 A.D. where the students believe the world will end in the new millennium.

Zack and his father go to Hawaii where Zack has an unfortunate encounter with an angry volcano goddess.

There's something weird about Zack's new friend Icky. It's not just the bandages or the Egyptian writing--but it might have something to do with being 3,000 years old!

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

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

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.

When magic enables Zack's eighty-eight-year-old grandmother to become a terrific batter, she ends up playing in a Chicago White Sox baseball game.

While on a class picnic in Central Park, ten-year-old Zack gets a chance to study ants close up and personal when he uses way too much of a classmate's diet powder and shrinks to their size.