"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 being sent to jail for the rest of their lives, George and Harold are taken on a trip back in time by Tippy Tinkletrousers back to their Kindergarten days where they must deal with their bully without the help of Captain Underpants.

After a fight with her mom, eleven-year-old Jennifer is sent back in time fiftry years. A city girl, she discovers she is now on a farm in Wisconsin. Petrified and confused, she tells her "new" parents she is not their daughter, Julie, but they do not believe her. Diagnosed with amnesia, Jennifer plays along, rather than be called crazy. After meeting Julie's best friend, Grace, the two try to solve Jennifer's problem. Before figuring out how to get...

Eight-year-old Jack and his younger sister Annie find a magic treehouse, which whisks them back to an ancient time zone where they see live dinosaurs.

Eight-year-old Jack and his younger sister Annie use the magic treehouse to travel back to the Middle Ages, where they explore a castle and are helped by a mysterious knight.