Zack bought a dinosaur egg at a flea market and it was not to go in a microwave.

Zack is nervous about the fifth-grade Halloween dance. He doesn't know how to dance and he doesn't have a date! When Zack meets Prudence, a beautiful girl who speaks with a funny accent and dresses in old-fashioned clothing, he's smitten. He thinks he's found the perfect date for the dance! Prudence is so different from the rest of the kids he knows. She's actually come from the past-the year 1692 to be exact-and she's fleeing the Salem witch trials! Will Zack and Prudence even make it to the dance, or will she have to return to the past? Read on to find out!

Uh-oh! Thanks to a heaping helping of a new dietetic sugar substitute, Zack shrinks down to the size of a bug. It's not all that bad--until he discovers an army of ants who are building an ant pyramid for their despotic pharaoh-queen!

Zack buys a dinosaur egg at a flea market, ignores the warning not to put it in the microwave, and ends up with a new pet.

The Zack Files #23.