On Christmas Eve, Jack and Annie's tree house transports them to King Arthur's castle at Camelot, where they undertake a quest to the castle of the Otherworld.

This ninth epic novel takes readers back in time to the carefree days of kindergarten, when the worst thing George and Harold had to face was not evil mad scientists or alien cafeteria ladies but a sixth-grade bully named Kipper Krupp, the nephew of their clueless school principal. And because George and Harold don't actually invent Captain Underpants until fourth grade, the two clever kindergartners are on their own -- using their brains to beat...

"Jack and Annie travel in the magic tree house to Galveston, Texas on September 8, 1900--the day of the worst natural disaster in US history"--

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.

The magic tree house transports Jack and Annie to the deck of the Titanic.

SpongeBob goes to another time in two royal adventures.

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

Tired of all the snow at the North Pole, Mrs. Claus takes a world tour before Christmas one year.

Jack and his younger sister take a trip in their tree house back to ancient Egypt, where they help a queen's mummy continue her voyage to the Next Life.

After recovering from being hit in the head during a baseball game, Stosh travels back in time to try to save Ray Chapman, a batter who was killed by a pitch in New York in 1920.