Rachel, one of the Earth teenagers dedicated to stopping the parasitic alien race known as the Yeerks, is horrified when she finds herself split into two nearly identical girls.

A boy named Jake wakes up to find himself twenty-five years old and in a world ruled by the aliens known as the Yeerks.

David's attempts to control the other Animorphs threatens to break up the group.

Warned never to stay in his animal shape for more than two hours, Tobias forgets when he becomes involved in a rescue campaign and faces being trapped in a hawk's body forever.

Endowed by a dying alien with the power to morph into any animal they touch, friends Jake, Rachel, Cassie, Tobias, and Marco investigate the wonders of the world with their unusual powers.

Determined to win a trophy of some kind, first-grader Roscoe swaps a hand-knitted sweater from his grandmother for the chance to enter his new neighbor's very clever dog in a trick contest.

Kek, an African refugee, is confronted by many strange things at the Minneapolis home of his aunt and cousin, as well as in his fifth grade classroom, and longs for his missing mother, but finds comfort in the company of a cow and her owner.

"Jake, Rachel, Tobias, Cassie, and Marco have a feeling they know where the Yeerk's new base is located. And they've even figured out how to get in -- how many people will really notice a few flies on the wall? But they never figured that they might get caught. Or that Jake could fall into the Yeerk pool. That Jake could become a human-Controller..."--Cover.

There's something pretty weird going on in the woods behind Cassie's house, the place where Ax and Tobias call home. It seems the Yeerks have figured out one very important fact: Andalites cannot survive without a feeding ground. Visser Three knows the "Andalite bandits" don't feed where he does, so there can only be one other place.Now the Animorphs have to figure out a way to stop a bogus logging operation. Because if Visser Three finds Ax in the...

The Yeerks finally realize that the Andalite Bandits are not aliens, but humans. Now, Tobias and the other Animorphs must protect themselves.