"When thirteen-year-old Arthur of Gal, the future King Arthur, accidentally time-travels to the twenty-first century, Sophie Sawyer, twelve, must convince him to return and correct the time line"--OCLC.

"When thirteen-year-old Margaret's father is sentenced to death for a crime he didn't commit, she knows the only way to save him is to use the forbidden family power of time travel"--

When we last saw our heroes, George and Harold, they had been turned into evil zombie nerds doomed to roam a devastated, post-apocalyptic planet for all eternity. But why, you might ask, didn't the amazing Captain Underpants save the boys from this frightening fate? Because Tippy Tinkletrousers and his time-traveling hijinks prevented George and Harold from creating Captain Underpants in the first place! Now, having changed the course of human history...

"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...

"A mysterious jukebox, old vinyl records, and cryptic notes on music history, are Shaheen's only clues to her father's abrupt disappearance. She looks to her cousin, Tannaz, who seems just as perplexed, before they both turn to the jukebox which starts ... glowing? Suddenly, the girls are pulled from their era and transported to another time! Keyed to the music on the record, the jukebox sends them through decade after decade of music history, from...

Teaming up with the Epoch Squad under the command of Richard Nixon, Delia and her fellow time travelers visit 1778 Versailles to save a historic alliance between France and the United States.

Having changed the course of human history after unwittingly wondering what could be worse than going to prison, George and Harold are shot through time back to kindergarten, where they are subjected to bullying and a clueless school principal.

Forced to abandon Princess Elizabeth when Mary ascends the English throne, Rose sews elaborate gowns for Mary's upcoming coronation before violently escalating attacks on Protestants compel her to escape into her own time.

"Join Jack and Annie as they as they meet one of the world's most famous illusionists - Harry Houdini!"--

Cass finds herself alone and disoriented in a dream-like world, while back at home she is in the hospital in a coma with Max-Ernest desperately searching for a way to awaken her.