Blue, a little alien from outer space, drives his human companions to distraction when he resists going to sleep.

Stranded on the moon after his extraordinary airplane takes him into outer space, a boy meets a marooned young Martian with a broken spacecraft, and the two new friends work together to return to their respective homes.

"Zack McGee has gotten in tons of trouble thanks to Amp, the four-inch-tall alien that crash-landed into his bedroom, but when Amp's commander, Ohm, comes to collect the stranded alien, it's Amp's turn in the hot seat!"-

Fourth-grader Zack McGee's life is turned upside-down when Amp, a tiny alien, crash-lands in his bedroom, then causes trouble at school while trying to get parts to repair his spaceship.

Injured in a bicycle accident, Zack discovers that his alien houseguest has swiped his brakes, placing Zack's baseball season in jeopardy while subjecting him to an annoying little brother.

Zeke spends Halloween in his true alien form, but when a jealous classmate decides to stop him from winning the school costume contest, Harris and Roxy must save the day.

When an alien alliance known as the Covenant lays siege to the planet Meridian, four high school students--Saskia, Dorian, Evie, and Victor--are thrust into battle to save their world. With their village in flames, the four find themselves stuck above ground, locked out of the town shelter where the rest of the survivors are gathers. With nothing but a few scavenged weapons and an injured Spartan, one of the UNSC's super-soldiers, they must tilt the...

Hilo and his friends must save the world from monsters from another dimension.

A story complemented by fun scientific facts and a do-it-yourself experiment finds young Zack working to protect his tiny alien friend, Amp, while struggling through a science-fair project and preventing an alien invasion.