The Animorph kids are joined in their fight against the evil Yeerks by Ax, an Andalite who is stranded on Earth until his alien pals return and who is seeking revenge against the alien who killed his brother.

Marco has never wanted to be an Animorph but the Yeerks are about to do something that will change his mind.

The Animorphs, Jake and Ax steal a Yeerk Bug fighter and end up in another time and another place, with no way home.

Jake, Ax, and the Animorphs wage war against the Yeerks who destroy everything and everyone in their path, until Jake discovers that the heartless Taxxons have their own problems with the Yeerks and just might provide valuable help.

"April and the others know the main reason they're still alive is because of their survival instincts and real-world knowledge. But in Everworld, even the things that you trust to keep you safe can be the very things to take your life ..."--Page 4 of cover.

While Jake and the other Animorphs try to stop Visser Three from reaching the Pemalite ship at the bottom of the ocean, they discover a strange underwater civilization.

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.

The war between the Yeerks and the Animorphs is still raging. There are no more secrets but plenty of lies. The kids are fighting harder than ever and they are about to make the biggest decision--a decision that may eventually break them all. Ax and the Animorphs have known that the ultimate destruction of the Yeerk pool will give them a huge chance to take back Earth. And they have figured out a way to do it. But there's no way to destroy the pool...

When Rachel morphs into a starfish she has the ability to regenerate her limbs, but when she demorphs back to being Rachel there is more to her than when she started out, a twin who is super strong and even nastier than she is.