When Uncle Al is kidnapped by Dr. Kron-Tox and sent to prehistoric times, Andrew, his cousin Judy, and Thudd the robot try to use Uncle Al's latest invention, the Time-A-Tron, to rescue him, and learn first-hand about the origins of the universe.

As two clever boys exploit a clerical oversight, each one discovers new perspectives on selfhood, friendship, and honesty. Identical twins Ray and Jay Grayson are moving to a new town. Again. But at least they’ll have each other’s company at their new school. Except, on the first day of sixth grade, Ray stays home sick, and Jay quickly discovers a major mistake: No one knows about his brother. Ray’s not on the attendance lists and doesn’t have a locker, or even a student folder. Jay decides that this lost information could be very…useful. And fun. Maybe even a little dangerous.

When Andrew and Judy’s neighbor gives her dog a bath, microscopic Andrew and Judy find themselves washed off the dog and lost in the bathroom! They’ll have to use their wits–and Thudd’s storehouse of facts–if they’re to survive run-ins with mold, mildew, an ocean of soapy water, and a predatory spider on their way back to the Atom Sucker.

Andrew, Judy, and Thudd have landed in the Australian rain forest. They must find a way to the river and Uncle Al, but they're still the size of bugs! They dodge rhinoceros beetles and tree kangaroos, dangle dangerously above the jaws of a carnivorous plant, and have a close encounter with a carpet python. Will they ever reach Uncle Al? Or will they be shrunken Down Under for good?

Includes excerpt from: Andrew lost with the bats!

Andrew, his cousin Judy, and super-smart robot Thudd hitch a ride out of the kitchen on the back of a fly and end up in the garden. The view is awfully nice from the head of a daisy, but time is running out. . . . They have to get back to the Atom Sucker and unshrink themselves before it’s too late!

When Andrew’s latest invention, the Atom Sucker, goes haywire, Andrew and Judy are shrunk down to microscopic level! Andrew and Judy find themselves lost on their neighbor’s dog, where they encounter everything from colossal fleas to crab-like eyelash mites. Now they have to find their way back to the Atom Sucker and get unshrunk before it’s too late!

Recounts the "History of Alexander's Conquests" of Ptolemy Lagides, a Macedonian officer who accompanied Alexander the Great during his conquests and who was later to lead the city of Alexandria in its triumph after Alexander's death.

"Twelve-year-old AZ dreams of becoming the world's greatest explorer. Instead, he's stuck in summer school with just Odd Uncle Arthur for company. Little does AZ know that this summer will be his most thrilling--and dangerous--adventure yet. After a time-traveling mishap, AZ finds himself in Ophir, a lost city full of wonder, secrets... and cursed tombs. AZ must rely on his new friends and his gut to get him home. But first, he must summon the courage to guard magic artifacts from a repulsive villain. Will blood-thirsty crocodiles, turbulent rapids, and a stomach-churning feast stand in his way? Or does he have what it takes to join the Alliance of World Explorers?"--

Andrew, Judy, and Thudd have escaped the Big Bang only to find themselves trapped inside the Earth as it forms all around them! Meanwhile Uncle Al is stranded in the Ice Age. Somehow Andrew, Judy, and Thudd must fix their time machine and rescue Uncle Al—before he becomes dinner for a sabertooth tiger! Kids, parents, and teachers love this series—kids for all its gooey grossness, and teachers and parents for all the fun science and great discussion points! “Andrew Lost books are gross and disgusting. That’s why we like them.”—The Washington Post “One cliff-hanger after another.”—School Library Journal “At the end of each book are additional pages of interesting facts . . . even when the stories end, the learning never stops.”—Kidsreads.com