A few days before his school's Halloween dance, Zack meets a girl who seems to be already wearing her costume.

"Mason and Ty were once the very best of friends, like two nerdy sides of the same coin . . . until seventh grade, when Ava Petrakis came along. Now Mason can trace everything bad in his life to that terrible fight they had over the new girl. The one thing he'd give anything for is a do-over. But that can't happen in real life--can it? As a science kid, Mason knows do-overs are impossible, so he can't believe it when he wakes up from a freak accident...

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.

"Join Patrick and Beth as they unravel the mysteries of the Imagination Station. The cousins travel to 1923 New York City, the home of Nikola Tesla, a quirky inventor. He has the knowledge to fix the damaged Imgination Stations. But can they get his help while keepig the machines' purpose a secret? Or will Tesla figure out how to alter time and change history? Meanwhile Patrick discovers an old friend - Eugene Meltsner - who has startling secrets...

"The magic tree house whisks Jack and Annie to Africa where they must use magic to save a rhino and her baby from poachers"--

Brandon and Kara agree to work off the cost of a broken window by cleaning crazy Dr. Wentmeyer's laboratory, where they discover a time machine and become its first passengers. Something goes horribly wrong, though, and the two friends find themselves millions of years in the past, trapped in a velociraptor nightmare!

Ranger, the time-traveling golden retriever, has landed in Viking age Iceland, where he helps a girl named Helga journey through the ash and smoke of an erupting volcano to find her father and bring him home.

Travel through time to the world of the dinosaurs in this exciting prehistoric fiction series for children. Jamie has just moved to Ammonite Bay, a stretch of coastline famed for its fossils. He's a member of the Dinosaur Club--a network of kids around the world who share dinosaur knowledge, help each other identify fossils, post new dino discoveries, and talk about all things prehistoric.In this adventure, Jamie and Tess come across a diplodocus...

"Tim and his best friends Tito and Oskar, the time-traveling T-Rex, battle the evil Weremoles--an army of hungry, sharp-toothed rock-munchers who are out to destroy their fair city of Metrosalis! Will Tim's worrying superpower help them defeat the underground monsters, or is doomsday just a worry away?"--

Jamie and Tess meet a group of compsognathus that look cute but turn out to be angry little predators.