The Yeerks aren't playing around anymore. They're no longer hiding behind a silent invasion. And one of the first steps in their new plan is to take over the National Guard, to prepare for all-out war against humanity. Marco and the other Animorphs couldn't be less prepared for this news. The Yeerks know who they are, forcing them to hide to protect their families. Things are falling apart, and for once Jake may not be able to make the decision that...

What's tasty, good for you, and only takes sixty seconds to make? Oatmeal. And because of a strange reaction to the Yeerk's physiology, it's making the would-be invaders of Earth more than a little crazy. Now Rachel and the other Animorphs have a new weapon against the Yeerks. Sounds good, right?Wrong. Because using this advantage against the Yeerks has dire consequences for their human hosts. In order to avoid hurting innocent people, the Animorphs...

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....

Rachel is captured by David, the sixth Animorph who was once trapped and left on a deserted island. He's back and wants revenge.

Rachel and Ax must evict the tiny alien Helmacrons from Marco's head and prevent them from stealing the morphing cube.

RL 5 ; 009-012. Rachael's got some pretty strange stuff happening. She can't control her morphing. What's going on? No one's sure, but Rachael and the Animorphs have to figure it out-quickly.

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.

The blue box Elfangor used to create the Animorphs has been found by David, but David doesn't know what it is. The Animorphs have to get that box at any cost. David ends up on the run with the Animorphs and Ax, and may become the sixth Animorph.

Attempting to get more information about the Yeerks, Jake is suddenly taken over by one of the parasitic aliens and becomes one of them, and the Animorphs launch a rescue mission.

David, the newest Animorph, is not what he appears. His need to control the other Animorphs is all he thinks about. And the things he does are starting to break up the group. Rachel and the others know that time is running out. The newest battle against the Yeerks is the most important one yet. And it's not one that will wait. Winning this fight could mean slowing down the invasion. But no one knows what to do with David. Because the newest Animorph...