Two very hungry dinosaurs discover a time machine and are instantly transported to America in 2018, where they are delighted to find themselves surrounded by food (including pizza and doughnuts), but soon less excited to find themselves surrounded by policemen with guns--so they escape to the time machine, not knowing where it will take them next.

"Teenaged Eddie meets a new girl who is a Senior Echo Time Agent from the future, come to his town to investigate the origin of time travel. Soon Eddie is swept up in the investigation and in time. But time travel is a dangerous business, and Eddie will learn more than he wants to know about his long-dead mother"--

Days before his thirteenth birthday, science-lover Finn learns that the women of his family are time travelers and he is expected to help locate his missing mother.

"A group of time-traveling teens races through history to try to stop time and the multiverse from unraveling"--

Seth cannot figure out if he is dead or alive. He cannot figure out where he is, though it seems as if he is in the English town he lived in as a child before his family moved to America.

When Polly O'Keefe visits her grandparents in Connecticut, she has an encounter with some people who existed over 3,000 years ago.

Publisher Annotation: Tom Edison (no, not that Tom Edison) is a hopeful janitor who dreams of becoming a scientist?and Dr. Morice is a shy scientist who dreams of making friends. When an accident at the lab sends them back in time to the stone age, Tom and Dr. Morice must work together to face down cavemen, saber-tooth tigers, and other B.C. hazards, with only one problem: Tom isn?t very good at science, and Dr. Morice isn?t very good with people....

While searching for Eugene, who is missing somewhere in time, time-travelling cousins Patick and Beth arrive on an orphan train heading west in 1874 and befriend an orphan falsely accused of being part of a train robbery.

"Seventeen-year-old Mitchell discovers a time-travel device that will allow him to escape his internship in Hell's accounting office and return to Earth, but his plans to alter the circumstances of his own death take an unexpected turn when his three closest friends in Hell insist on accompanying him back to the land of the living"--

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!
It’s a dream vacation for Jack and Annie—or is it? When Teddy, a young sorcerer, offers to send Jack and Annie on a dream vacation, they can’t wait to go. The brother-and-sister pair wish for a trip to a beach paradise, and the magic tree house whisks them off to the coast of Mexico. Everything starts...