It seems like a regular field trip to a natural history museum—until Zack gets locked inside for the night and discovers what really goes on in those display cases when no one is watching. A tribe of curious Neanderthals, rampaging woolly mammoths, prehistoric food shortages . . . it’s just another wild adventure for Zack!

It seems like a regular field trip to a natural history museum—until Zack gets locked inside for the night and discovers what really goes on in those display cases when no one is watching. A tribe of curious Neanderthals, rampaging woolly mammoths, prehistoric food shortages . . . it’s just another wild adventure for Zack!

Late one night when Zack hears strains of "Heartbreak Hotel" coming from the fridge, he discovers the possibility that Elvis lives on...as a turnip! Talk about getting back to musical roots!

Who'd have thought mind reading could be such a pain? I mean, I expected to discover everyone's silly secrets. But someone is planning something very strange--and it's no joke!

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!

One minute, it was an Egyptian cat stature. The next, it was real, live cat with sharp claws. And I have the scratch to prove it! This was one trip to the museum I would never forget.

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!