A hypnotist's show turns out to be way more than Zack bargains for when he is pulled out of the audience, put into a trance, and his body is "taken over" by the spirit of someone from the past. And that's only the beginning, because the stubborn spirit won't go away when the show's over! It's hard enough having just one self to worry about. What will Zack do with two?

A hypnotist's show turns out to be way more than Zack bargains for when he is pulled out of the audience, put into a trance, and his body is "taken over" by the spirit of someone from the past. And that's only the beginning, because the stubborn spirit won't go away when the show's over! It's hard enough having just one self to worry about. What will Zack do with two?

Mummies are cool, but they’re creepy, too! Zack has faced aliens, vampires, time-travelers, ghosts, and Bigfoot—now find out what happens when he meets teenage mummy Ikhnaton (Icky for short).

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!

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!

"My clone looks like me. My clone talks like me. He helps me with my homework and takes care of my bullies. And he could be the answer to all my problems. Or he could be my biggest one yet!

What would you do if your fortune cookie fortunes started coming true? Confucius says something very weird is going on! Could his thirteenth adventure be Zack's unlucky number?

My room is a mess. Now, usually this is not big news. But my clothes have started moving...when I'm not inside them. And the TV is floating across the room! Guess what! I'm sharing my room with a ghost named Wanda.

One minute I was looking for my retainer in the bathroom. The next, I was staring at a boy who looked just like me. And I don't mean my reflection! What's going on here?

When Zack and his dad come upon an alien whose spacecraft is running on empty in Central Park, it's easy enough to find more fuel. (Mayonnaise!) But retrieving the abandoned spaceship from the NYPD is quite a different story!