This is a list of all books in the Animorphs series, by K. A. Applegate.

The Hork-Bajir Chronicles

• Copyright date: 1998
• Number of pages: 206
• Summary: The Yeerks try to enslave the Hork-Bajir. Aldrea, an Andalite, tries to help the Hork-Bajir.

Available in hardcover.

The Andalite Chronicles

• Copyright date: 1997
• Number of pages: 326
• Summary: Takes place before and leading up to the events in The Invasion. It is narrated by Elfangor-Sirinial-Shamtul, or, as he is later known, Prince Elfangor. It begins with him uploading his memory into the computer before facing Visser Three at the abandoned construction site. The rest of the book is then a flashback of Elfangor's personal history, beginning with him as an Aristh, a warrior in training, and ending with him at the construction site.

Animorphs 1: The Invasion

• Copyright date: 1996
• Release date: June 1996
• Number of pages: 184
• Cover art: Jake morphs into a green anole.
• Cover artist: Peter Bollinger
• Cover quote: Some people never change. Some do...
• Narrator: Jake
• Summary: Jake, Marco, Cassie, Rachel and Tobias were walking home through an abandoned construction site, when an alien spacecraft lands nearby. The alien, an Andalite named Prince Elfangor, explains that the Earth is being invaded by another race of aliens, called the Yeerks. To combat them, he gives the humans morphing technology, the power to become another species.

Animorphs 2: The Visitor

• Copyright date: 1996
• Number of pages: 175
• Cover art: Rachel morphs into a cat.
• Cover quote: No one knows who they are...
• Narrator: Rachel

Animorphs 3: The Encounter

• Copyright date: 1996
• Number of pages: 154
• Cover art: Tobias morphs into a red-tailed hawk.
• Cover quote: Now you see them. Now you don't...
• Narrator: Tobias

Animorphs 4: The Message

• Copyright date: 1996
• Number of pages: 151
• Cover art: Cassie morphs into a bottle-nosed dolphin.
• Cover artist: David B. Mattingly
• Cover quote: Sometimes you have to change a little more than your mind...
• Narrator: Cassie

Animorphs 5: The Predator

• Copyright date: 1996
• Number of pages: 150
• Cover art: Marco morphs into a gorilla.
• Cover artist: David B. Mattingly
• Cover quote: What you see isn't always what you get...
• Narrator: Marco

Animorphs 6: The Capture

• Copyright date: 1997
• Number of pages: 154
• Cover art: Jake morphs into a fly.
• Cover artist: David B. Mattingly
• Cover quote: Now, he's one of them...
• Narrator: Jake

Animorphs 7: The Stranger

• Copyright date: 1997
• Number of pages: 163
• Cover art: Rachel morphs into a grizzly bear.
• Cover artist: David B. Mattingly
• Cover quote: This time there may be no way out...
• Narrator: Rachel

Megamorphs 1: The Andalite's Gift

• Copyright date: 1997
• Number of pages: 227
• Cover artist: David B. Mattingly
• Narrators: Jake, Cassie, Marco, Rachel, and sometimes Ax and Tobias

Animorphs 8: The Alien

• Copyright date: 1997
• Number of pages: 159
• Cover art: Ax morphs into a human.
• Cover artist: David B. Mattingly
• Narrator: Ax

Animorphs 9: The Secret

• Copyright date: 1997
• Number of pages: 158
• Cover art: Cassie morphs into a wolf.
• Cover artist: Damon C. Torres/The 1-Way Company
• Cover quote: No place to run. No place to hide...
• Narrator: Cassie

Animorphs 10: The Android

• Copyright date: 1997
• Number of pages: 170
• Cover art: Marco morphs into a wolf spider.
• Cover artist: Damon C. Torres/The 1-Way Company
• Narrator: Marco

Animorphs 11: The Forgotten

• Copyright date: 1997
• Number of pages: 162
• Cover art: Jake morphs into a jaguar.
• Cover artist: David B. Mattingly
• Cover quote: Nothing is what it seems...
• Narrator: Jake

Animorphs 12: The Reaction

• Copyright date: 1997
• Number of pages: 152
• Cover art: Rachel morphs into a crocodile.
• Cover artist: Damon C. Torres/The 1-Way Company
• Cover quote: Trust no one...
• Narrator: Rachel

Animorphs 13: The Change

• Copyright date: 1997
• Number of pages: 162
• Cover art: Tobias (red-tailed hawk) morphs into Tobias (human).
• Cover artist: David B. Mattingly
• Cover quote: Be afraid...
• Narrator: Tobias

Animorphs 14: The Unknown

• Copyright date: 1998
• Number of pages: 166
• Cover art: Cassie morphs into a horse.
• Cover artist: David B. Mattingly
• Cover quote: Never underestimate the power of a morph...
• Narrator: Cassie

Animorphs 15: The Escape

• Copyright date: 1998
• Number of pages: 163
• Cover art: Marco morphs into a hammerhead shark.
• Cover quote: The Yeerks are out there...
• Narrator: Marco

Animorphs 16: The Warning

• Copyright date: 1998
• Number of pages: 146
• Cover art: Jake morphs into a rhinoceros.
• Cover artist: David B. Mattingly
• Cover quote: Now it'll take more than the truth to set you free...
• Narrator: Jake

Animorphs 17: The Underground

• Copyright date: 1998
• Number of pages: 164
• Cover art: Rachel morphs into a bat.
• Cover artist: David B. Mattingly
• Cover quote: There's nothing to fear but the Yeerks themselves...
• Narrator: Rachel

Animorphs 18: The Decision

• Copyright date: 1998
• Number of pages: 161
• Cover art: Ax morphs into a mosquito.
• Cover artist: David B. Mattingly
• Cover quote: Change a litlle. Change a lot. Just change...
• Narrator: Ax

Megamorphs 2: In the Time of the Dinosaurs

• Copyright date: 1998
• Number of pages: 229
• Cover artist: David B. Mattingly
• Narrators: Jake, Marco, Rachel, Cassie, Tobias, Ax

Animorphs 19: The Departure

• Copyright date: 1998
• Number of pages: 159
• Cover art: Cassie morphs into a butterfly.
• Cover artist: David B. Mattingly
• Cover quote: There's always room for a little change...
• Narrator: Cassie

Animorphs 20: The Discovery

• Copyright date: 1998
• Number of pages: 153
• Cover art: Marco morphs into a cobra.
• Cover artist: David B. Mattingly
• Cover quote: Get ready. There's a brand-new Animorph...
• Narrator: Marco

Animorphs 21: The Threat

• Copyright date: 1998
• Number of pages: 158
• Cover art: Jake morphs into a golden-retriever dog.
• Cover artist: David B. Mattingly
• Cover quote: The newest Animorph has a secret. And it's not good...
• Narrator: Jake

Animorphs 22: The Solution

• Copyright date: 1998
• Number of pages: 152
• Cover art: Rachel morphs into a rat.
• Cover quote: A mistake has been made. His name is David.
• Narrator: Rachel

Animorphs 23: The Pretender

• Copyright date: 1998
• Number of pages: 154
• Cover art: Tobias morphs into a rabbit.
• Cover artist: David B. Mattingly
• Cover quote: Tobias is about to discover the secrets of his past...
• Narrator: Tobias

Animorphs 24: The Suspicion

• Copyright date: 1998
• Number of pages: 154
• Cover art: Cassie morphs into an anteater.
• Cover artist: David B. Mattingly
• Cover quote: What counts is on the inside. Most of the time...
• Narrator: Cassie

Animorphs 25: The Extreme

• Copyright date: 1999
• Number of pages: 146
• Cover art: Marco morphs into a polar bear.
• Cover artist: David B. Mattingly
• Cover quote: So many Yeerks, so little time...
• Narrator: Marco

Animorphs 26: The Attack

• Copyright date: 1999
• Number of pages: 145
• Cover art: Jake morphs into a Siberian tiger.
• Cover artist: David B. Mattingly
• Cover quote: Change is necessary...
• Narrator: Jake

Animorphs 27: The Exposed

• Copyright date: 1999
• Number of pages: 154
• Cover art: Rachel morphs into a giant squid.
• Cover artist: David B. Mattingly
• Cover quote: They thought they'd seen it all. They were wrong...
• Narrator: Rachel

Animorphs 28: The Experiment

• Copyright date: 1999
• Number of pages: 139
• Cover art: Ax morphs into a cow.
• Cover artist: David B. Mattingly
• Cover quote: Change is a good thing. A very good thing...
• Narrator: Ax

Alternamorphs 1: The First Journey

• Copyright date: 1999
• Number of pages: 155
• Cover artist: David B. Mattingly

In the style of Choose Your Own Adventure and Give Yourself Goosebumps.

Animorphs 29: The Sickness

• Copyright date: 1999
• Number of pages: 152
• Cover art: Cassie morphs into a Yeerk.
• Cover quote: Cassie is about to make a change for the better...
• Narrator: Cassie

Megamorphs 3: Elfangor's Secret

• Copyright date: 1999
• Number of pages: 208
• Cover artist: David B. Mattingly

Animorphs 30: The Reunion

• Copyright date: 1999
• Number of pages: 156
• Cover art: Marco morphs into a cockroach.
• Cover artist: David B. Mattingly
• Cover quote: Marco must make the ultimate sacrifice...
• Narrator: Marco

Animorphs 31: The Conspiracy

• Copright date: 1999
• Number of pages: 139
• Cover art: Jake morphs into a peregrine falcon.
• Cover artist: David B. Mattingly
• Cover quote: When they say, "It's all in your head," believe it...
• Narrator: Jake

Animorphs 32: The Separation

• Copyright date: 1999
• Number of pages: 158
• Cover art: Rachel morphs into a starfish.
• Cover artist: David B. Mattingly
• Cover quote: Everything changes. But not quite like this...
• Narrator: Rachel

Animorphs 33: The Illusion

• Copyright date: 1999
• Number of pages: 156
• Cover art: Tobias morphs into an Andalite (Ax).
• Cover artist: David B. Mattingly
• Cover quote: Change happens. Whether we like it or not...
• Narrator: Tobias

Animorphs 34: The Prophecy

• Copyright date: 1999
• Number of pages: 141
• Cover art: Cassie morphs into a Hork-Bajir.
• Cover artist: David B. Mattingly
• Cover quote: What you don't know can't hurt you. Except for the Yeerks...
• Art Direction/Design: Karen Hudson
• Narrator: Cassie

Visser

• Copyright date: 1999
• Number of pages: 192

Available in hardcover.

Animorphs 35: The Proposal

• Copyright date: 1999
• Number of pages: 147
• Cover art: Marco morphs into a poodle.
• Cover artist: David B. Mattingly
• Cover quote: What's on your mind...?
• Art Direction/Design: Karen Hudson
• Narrator: Marco

Animorphs 36: The Mutation

• Copyright date: 1999
• Number of pages: 142
• Cover art: Jake morphs into an orca.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson
• Narrator: Jake

Animorphs 37: The Weakness

• Copyright date: 1999
• Number of pages: 129
• Cover art: Rachel morphs into a cheetah.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson
• Narrator: Rachel

Animorphs 38: The Arrival

• Copyright date: 2000
• Number of pages: 148
• Cover art: Ax morphs into a northern harrier.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson
• Narrator: Ax

Animorphs 39: The Hidden

• Copyright date: 2000
• Number of pages: 121
• Cover art: Cassie morphs into a buffalo.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Usrula Albano
• Narrator: Cassie

Animorphs 40: The Other

• Copyright date: 2000
• Number of pages: 130
• Cover art: Marco morphs into a honeybee.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: Marco

Alternamorphs 2: The Next Passage

• Copyright date: 2000
• Number of pages: 104
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano

Megamorphs 4: Back to Before

• Copyright date: 2000
• Number of pages: 179
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano

Animorphs 41: The Familiar

• Copyright date: 2000
• Number of pages: 143
• Cover art: Jake morphs into himself as an adult.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: Jake

Animorphs 42: The Journey

• Copyright date: 2000
• Number of pages: 139
• Cover art: Rachel morphs into an African elephant.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: Rachel

Animorphs 43: The Test

• Copyright date: 2000
• Number of pages: 135
• Cover art: Tobias morphs into a Taxxon.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano
• Cover Quote: Tobias is about to face his biggest fear....
• Narrator: Tobias

Animorphs 44: The Unexpected

• Copyright date: 2000
• Number of pages: 143
• Cover art: Cassie morphs into a kangaroo.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: Cassie

Animorphs 45: The Revelation

• Copyright date: 2000
• Number of pages: 136
• Cover art: Marco morphs into an ant.
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: Marco

Animorphs 46: The Deception

• Copyright date: 2000
• Number of pages: 118
• Cover art: Ax morphs into a human, specifically a fighter pilot.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: Ax

The Ellimist Chronicles

• Copyright date: 2000
• Number of pages: 200
• Cover artist: Romas Kualis
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: The Ellimist

Animorphs 47: The Resistance

• Copyright date: 2000
• Number of pages: 141
• Cover art: Jake morphs into a beaver.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: Jake

Animorphs 48: The Return

• Copyright date: 2000
• Number of pages: 148
• Cover art: Rachel morphs into herself as a monster.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: Rachel

Animorphs 49: The Diversion

• Copyright date: 2001
• Number of pages: 164
• Cover art: Tobias morphs into a German shephard dog.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: Tobias

Animorphs 50: The Ultimate

• Copyright date: 2001
• Number of pages: 139
• Cover art: Cassie morphs into a great-horned owl.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: Cassie

Animorphs 51: The Absolute

• Copyright date: 2001
• Number of pages: 149
• Cover art: Marco morphs into a duck.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: Marco

Animorphs 52: The Sacrifice

• Copyright date: 2001
• Number of pages: 151
• Cover art: Ax morphs into a raccoon.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: Ax

Animorphs 53: The Answer

• Copyright date: 2001
• Number of pages: 157
• Cover art: Jake morphs into an anaconda.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano
• Narrator: Jake

Animorphs 54: The Beginning

• Copyright: 2001
• Number of pages: 156
• Cover art: The silhouettes of each of the Animorphs and Ax within each other.
• Cover artist: David B. Mattingly
• Art Direction/Design: Karen Hudson/Ursula Albano

The final book in the Animorphs series.