"A.J. and the gang at Ella Mentry School are in for a super surprise when a new teacher, Mr. Cooper, take over their third grade class." --

Second-grade detectives Jigsaw, Mila, and their friends follow clues found in a Little Free Library suggesting that aliens are coming to Earth.

"Eleven-year-old Ruby, a Black girl who loves studying insects, accidentally captures an alien bug, but when the creature escapes and starts wreaking havoc around the neighborhood, it is up to Ruby and her rag-tag group of friends to find this new invasive species before the feds do"--Title verso page.

New third grade teacher Mr. Granite has so many strange ideas about how to make Ella Mentary School environmentally friendly that the students are sure he must be an alien.

Buddy Burger escapes his home planet, lands in Hollywood, and is cast in a new television series, but must pretend his six eyes and suction-cup feet are the costume and his human skin, real.

The reader's decisions determine what happens when a boy who is spending the summer in Canada's Yukon Territory meets an alien that has come to Earth aboard a Soviet shuttle.

"Seth, Anaya, and Petra had just won over fighting the plant invasion, when the rain starts again and brings eggs. That hatch into insects. Not small insects, but bird-sized mosquitoes that carry disease. Borer worms that can eat through the foundation of a house. Boat-sized water striders that carry away their prey. But our heroes aren't able to help this time--they've been locked away in a government lab with other kids who are also immune."--

Seven-year-olds Bradley, Brian, Nate, and Lucy make observations and gather clues that convince them that their older siblings, cousin, and animals have been captured by hungry space aliens.

"The Voyagers land on a planet made entirely of water where they must find the third element of the Source that will save the Earth"--

Space mouse Geronimo Stiltonix must replace the batteries in his damaged spaceship by tracking down a rare element, but he is wary of a group of mysterious aliens who offer their help.