Zach, a human boy who is actually an extraterrestrial agent for the Galactic Union, travels to California's Lassen Volcanic National Park on a dangerous mission to save the Earth from evil aliens known as the Syndicate.

I thought things would change when I found the others. We would stop running. We would fight the Mogadorians. And We would win. But I was wrong. Though we came together, we barely escaped with our lives. And now we hide. The six of us are powerful - but not strong enough to take on army. We haven't discovered our full legacies. We haven't learned to work together. And time is running out, because we need to find Number Five before they do. The battle...

Uneasy about her new substitute teacher, Susan Simmons' suspicions about Mr. Smith are confirmed when she discovers he is an alien determined to bring some sixth-grade specimens back to his planet.

While Nita's sister and her dad host three young alien wizards, teenage wizards Nita and Kit travel halfway across the galaxy as part of an exchange program and find themselves again caught up in the dark doings of their nemesis, the Lone Power.

"High school senior Cara Sweeney gets more than she bargained for when she agrees to participate in earth's first intergalactic high school exchange program"-- Provided by publisher.

"Cassie Sullivan, the survivor of an alien invasion, must rescue her young brother from the enemy with help from a boy who may be one of them"--Provided by publisher of original edition.

For years the Garde have fought the Mogadorians in secret, but now the invasion has begun. If the Garde can't find a way to stop the Mogs, humanity will suffer the same fate as the Lorien: annihilation. When the Elders sent the Garde to Earth, they had a plan -- one which the Garde are finally starting to understand. A group of the Garde traveled to an ancient pyramid in Mexico where they awoke a power that had been hidden for generations. Now this...

While at a resort on a vacation trip his uncle won, Zack begins wondering if his cousin has been telling the truth for years- that he is really an alien prince sent to Earth for protection, and who is now being chased by enemy aliens disguised as bald, fat men.

Orphaned at age five, Lucinda, now fifteen, stands with courage against the man who took everything from her, aided by a thief, a clever goat, and a mysterious woman called the Witch of Amaranth, while the prince she knew as a child prepares to marry, unaware that he, too, is in danger.

When aspiring author Josh Higgins learns that his favorite author is coming to town, he and his sister Maggie convince fantasy writer P.L. Cuthbertson to take them to the magical medieval land of Wyrd World, where they find real trouble.