Cassie's had it. After the last mission, she realizes she's getting tired of missions. Tired of battles. Tired of being an Animorph. She decides that she just can't do it anymore. So she quits.But the war for her planet isn't so easy to quit. It seems a human-Controller named Karen followed Cassie after the last run-in with the Yeerks, and she knows Cassie has the ability to morph. If she exposes Cassie, it's all over. No more Cassie. No more Animorphs. No more planet Earth.

Elfangor-Sirinial-Shamtul is an Andalite war prince--the one who gave the Animorphs the power to morph. "The Andalite Chronicles" is the story of how this warrior-cadet ended up on planet Earth Ages 9-12. Pub: 12/97.

There's a new rumor in town. Someone has discovered an item that proves life on other planets exists, and they've been hiding it on a base called Zone 91, the most secret place on Earth. Cassie and the other Animorphs already know about life on other planets. Too well. Their enemies the Yeerks will try to access Zone 91, to find out if what's there will threaten their mission to conquer to the planet. So the Animorphs decide to pay Zone 91 and the Yeerks a little visit. But what they discover is not at all what they expect.

When Tobias and his friends were given the power to morph, they were also given an important warning: Never stay in a morph for more than two hours. But Tobias broke the time limit and now he’s trapped in the body of a hawk … forever. When he discovers an important Yeerk secret, Tobias knows he has to do everything in his power to destroy it. But to do so, he’ll have to contend with a part of himself that’s wrestling for control. A part that isn’t human.

There is a new Animorph. And he's arrived just in time, because the Yeerks are preparing their biggest takeover ever. Their ultimate target: the world's most powerful leaders, all gathered together in one place. What better way to get into the minds of humans? Literally.At first, David joins the fight with a vengeance. But there's definitely something wrong. Because he's starting to break the rules, taking risks that could get them all captured. Or killed. The Animorphs don't know what to do. There was a time when the Yeerks were their greatest enemy, but that's about to change...

David discovers the secret on the Animorphs in a blue box. Animorphs.