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.

Alien Invasion of Earth!Peter Thompson, a typical seventh-grader, finds himself touring the planet with his friends Susan Simmons and Duncan Dougal, and three aliens in disguise!Their mission? To file the final report that will determine Earth's future in the universe.As the clock ticks away the hours before their meeting in space, the tour becomes weirder and weirder. The three friends come face-to-face with a plague of poots and "Big Julie" -- the...

Peter Thompson chooses to return to space with the alien Broxholm who has been masquerading as a teacher in order to study humans, but he is alarmed to discover the rulers of the galaxy are debating how to solve the problem of violent, destructive, underachieving Earthlings.

Nita and Kit rejoin forces when a strange darkness of the mind overcomes the older wizards, stealing away their power, and forcing the younger wizards to go to war to save the world.

When Jake has to leave town for a family thing, the other Animorphs and Ax figure life will pretty much be normal until he gets back. But when Tobias discovers Visser Three's newest feeding place, the kids decide they have to check it out. But there's no assigned leader. Who will be the best one for the job? Being in chare isn't just guts and glory. It's about making decisions that will mean the difference between life ... and death.

Menolly flees her home because she is not permitted to make music there, and is taken by the Masterharper himself to Harper Hall, where she learns that only her own self-doubt stands in her way.