George and Harold are forced to contemplate a world without Captain Underpants.

Time has gone wrong, and best friends Dak Smyth and Sera Froste, together with the young Hystorian Riq, must use the infinity ring to travel back to one of the Great Breaks--a mutiny on the Santa Maraia--to correct history and defeat the SQ.

While backpacking solo in the desert, thirteen-year-old Mark falls into a tube of blue light and is transported into a more primitive world, where he must use his knowledge and skills to survive.

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

In their magic treehouse, Jack and Annie are again transported to King Arthur's realm, where invisible beings, giant ravens, and mistaken magic spells have a duke's castle in an uproar on Halloween night.

The Time Traders Andre Norton - The first novel in the classic series, in which wars are no longer fought on land, in the air, or on the sea-but throughout time and space itself . . . The never-ending tension between Russia and the United States has been escalated by a stunning new variable: time travel. While the Americans can roughly utilize the technology, the Russians have learned the secret of space travel-and that makes the US vulnerable. What...

Joe uses his ability to travel through time using vintage baseball cards to take his coach Flip with him to find out whether Satchel Paige really was the fastest pitcher ever.

Jack and Annie travel back in time in the magic treehouse to Egypt and meet Florence Nightingale, who is on the trip that will influence her life and the decisions that will make her famous.

"Miss Z, a mysterious billionaire and a collector of rare photographs, is sending her four recruits back in time on a mission to capture, for the first time, one of the most important moments in American history--Abraham Lincoln giving his famous Gettysburg address"--

"World War II is raging across Europe and the Axis and Allied powers are in a stalemate. Dak, Sera, and Riq can tip the scales in the Allies' favor if they can pull off the most daring spy mission of all time. But even if they succeed, are they playing into the SQ's hands?" --Back cover.