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

New York Times best-selling author. Attention Minecraft players: Take an adventure right into the game you love! Can Gameknight999 survive a Minecraft journey 100 years into the past? This adventure series is created especially for those who love the fight of good vs. evil, magical academies like Hogwarts in the Harry Potter saga, and games like Minecraft, Terraria, and Pokémon GO. A freak thunderstorm strikes just as Gameknight999 is activating...

When Farmer Brett and his apprentice Joe fall down a hole and land in the middle of the historic Wither War, they find out that their history is far more complicated than they learned in school.

"In the fourth book in the Asha and Baz series, readers learn about volcanoes from renowned volcanologist Katria Kraft! Asha wants to win a super cool volcanic rock by solving the Great Volcano Challenge at school. So she and her best friend Baz use their magic stick to travel to Iceland in 1973 to learn from famous volcano researcher Katia Krafft. She's sure to be able to help them with their project, but she's got an eruption to observe and data...

When Geronimo Stilton and his friends time travel to three different centuries seeking artifacts missing from the mouseum, they meet Alexander the Great, Queen Cleopatra, Francis Drake, and Mozart.

The Histronauts travel back in time to the Viking era to forage for food, decipher runes, build beautiful burial boats, and learn all about a Viking raid.

"In this wordless time-travel adventure, three children at a Passover seder visit ancient Egypt to help baby Moses find his way safely to Pharaoh's daughter. When a family settles at the table for Passover, their dog nabs the afikomen bag (containing matzah used for the seder) and dives under the tablecloth. The children follow him and find themselves transported to ancient Egypt. There, they see baby Moses' mother and sister Miriam placing him in...

Time travelers Jonah and Katherine arrive in 1611 to rescue missing child John Hudson, son of the explorer Henry Hudson, but just as the mutiny on the Discovery is supposed to start, Jonah and Katherine's knowledge of history is tested once again, and they fear that more is at stake than just one boy's life. Author's note includes facts about Henry Hudson's explorations.

Billy Chan and his friends have been transported 5,000 years into the future where the evil Dragon of Death has become ruler of Dragon City. Humans now live to serve the dragon population, and it's no different for Billy, Charlotte, Dylan, and Ling-Fei. After losing contact with their own dragons, they're determined to track them down in this new city, even if it means putting their own lives at risk. But one dragon has turned to the dark side and...

Discovering a way to tip the scales in favor of the Allied forces when World War II reaches a stalemate, time travelers Dak, Sera and Riq contemplate an audacious spy mission while worrying that their success is rendering them more subject to the control of SQ.