Book 1

We never should have done it. But we needed a break. You know, some time off from the superhero stuff. A chance to act like normal kids. Well -- as normal as four kids who can morph, a hawk, and an alien can be. Everything should have been cool.

Book 1

The Invasion

by Katherine Applegate

Published 1 June 1996
Sometimes weird things happen to people. Ask Jake. He may tell you about the night he and his friends saw the strange light in the sky. He may even tell you about what happened when they realized the "light" was only a plane -- from another planet.

Book 2

We could blame everything that happened on Marco. He was the one who heard about the downed submarine. He was the one who thought we should check it out. And everyone knows that if Marco's up to a challenge, I'm definitely there.

Book 2

The Visitor

by Katherine Applegate

Published 1 June 1996
Morphing is certainly more fun than Sega -- you can soar as an eagle and walk as a cat. But being an ANIMORPH is by no means just fun and games. Rachel knew better than anyone. One of her best friends, Melissa, is acting very strange. And it looks like Melissa's dad, who is also the school's Assistant Principal, may be connected to evil aliens. Rachel can't tell Melissa what the ANIMORPHS have learned, but Melissa doesn't seem interested in talking to Rachel these days anyway. Could Melissa be one of "them?"

Book 2

The Next Passage

by Katherine Applegate

Published 1 April 2000
In a choose your own adventure story, the reader must decide what to do when an alien demands a mysterious blue box in return for not killing the reader's character's father.

Book 2

Megamorphs

by Katherine Applegate

Published 20 August 1999

Book 3

The Encounter

by Katherine Applegate

Published 1 August 1996
When Tobias, Jake, Rachel, Marco and Cassie were given the ability to morph, they were also given one very important warning: Never stay in a morph for more than two hours. But Tobias stayed in his morph for too long. Now he's a hawk -- with a boy's mind -- forever.

Book 4

The Message

by Katherine Applegate

Published 1 October 1996
It all started with the dreams. But Cassie didn't pay much attention to them. She and her friends had all been having weird dreams since they'd first learned to morph. Maybe it was just some crazy side effect.

Book 4

Back to before

by Katherine Applegate

Published 1 May 2000
Jake's finally weakened. After a grisly battle, the Drode offers the Animorphs' leader an escape from the terrifying pressure. He'll reverse the decision to start the Animorphs. Now, there's no morphing, no missions, and no knowledge of the Yeerks. That is, until very strange things begin to happen and Jake, Rachel, Tobias, Cassie, Marco and Ax are forced to confront their new reality.

Book 5

The Predator

by Katherine Applegate

Published 1 January 1996
Marco never wanted to be an Animorph. He never wanted the ability to change into any animal he touches. He just wants to chill. Whatever happens, happens.

Book 6

The Capture

by Katherine Applegate

Published 1 February 1997
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.

Book 7

Stranger

by Katherine Applegate

Published 1 April 1997
Okay. Rachel and the other Animorphs have finally found the new entrance to the Yeerk pool. They've even figured out a way to sneak in. The infamous roach morph. But they didn't count on roaches being a Taxxon delicacy. This time escape doesn't look so good.

Book 8

The Alien

by Katherine Applegate

Published 1 July 1997
What would you do if you were the only alien trapped on a strange planet? Probably freak out, right? Well, that's what Ax feels like doing. But as an Andalite warrior-cadet, he has to be pretty cool about stuff like that. He's been hanging out with the Animorphs ever since the Dome ship was destroyed by the Yeerks and his brother, Prince Elfangor, was destroyed by Visser Three.

Book 9

The Secret

by Katherine Applegate

Published 1 August 1997
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 thing: 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.

Book 10

The Android

by Katherine Applegate

Published 1 September 1997
When Marco runs into his old friend Erek he doesn't think too much of it. He's got a couple of more important things to do. Like helping to save the world. But then Marco finds out Erek's been hanging with some of the kids at The Sharing. And he starts to think that something just a little weird is going on.

Book 11

The Forgotten

by Katherine Applegate

Published 1 October 1997

Book 12

The Reaction

by Katherine Applegate

Published 15 January 1999

Book 13

The Change

by Katherine Applegate

Published 19 February 1999

Book 14

The Unknown

by Katherine Applegate

Published 19 March 1999

Book 15

The Escape

by Katherine Applegate

Published 1 February 1998
Almost nothing could be as bad as finding out your mother is Visser One. The most powerful of all Vissers. The leader of the Yeerk invasion of Earth. But it happened to Marco. And even though he's been handling it pretty well, he knew there'd come a time when he'd have to face her again. Knowing that the Yeerk in her brain had taken his mother away.