Animorphs Books in Order
Animorphs is a young-adult science fiction series in which five human kids and one alien gain the power to morph into any animal they touch, using it to wage a secret guerrilla war against the parasitic Yeerk invasion of Earth. The main run spans 54 numbered novels (1996-2001), supplemented by the Megamorphs and Chronicles companion volumes.
Publication order
In the order the books were originally released.
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Buy on Amazon1996 · Katherine Applegate
A 1996 novel by Katherine Applegate. Jake, an average suburban kid, is confronted one night by a creature from space who teaches him to morph into…
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Buy on Amazon1996 · Katherine Applegate
Rachel is still reeling from the news that the Earth is secretly under attack by parasitic aliens. And that she and her friends are the planet's only…
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Buy on Amazon1996 · Katherine Applegate
A 1996 novel by Katherine Applegate in which Tobias, given the power to morph along with his friends but warned never to stay in a morph for more…
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Buy on Amazon1996 · Katherine Applegate
It all started with the dreams. Cassie and her friends had been having strange dreams since they learned to morph. At first, she ignored them,…
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Buy on Amazon1996 · Katherine Applegate
Marco is a reluctant Animorph, given the ability, along with four other friends, to change into animal forms by an Andalite prince seeking help…
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Buy on Amazon1997 · Katherine Applegate
In this 1997 novel by Katherine Applegate, the Animorphs face serious danger when they transform into flies to infiltrate the new base of the alien…
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Buy on Amazon1997 · Katherine Applegate
Rachel and the other Animorphs discover a new entrance to the Yeerk pool and plan to infiltrate it using a roach morph. However, they face an…
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Buy on Amazon1997 · Katherine Applegate
Ax, an Andalite warrior-cadet, is the only alien stranded on a strange planet. He feels the urge to freak out but must stay calm. He has been living…
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Buy on Amazon1997 · Katherine Applegate
When the Yeerks threaten a stretch of forest that the team has used as a refuge, Cassie leads the fight to protect the wildlife and a colony of…
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Buy on Amazon1997 · Katherine Applegate
Marco runs into his old friend Erek but doesn't think much of it. He is focused on more important tasks, like helping to save the world. However, he…
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Buy on Amazon1997 · Katherine Applegate
There's been an accident. A Yeerk Bug fighter crash-lands on Earth, and the Yeerks try to hide it. Tobias sees the crash, and the Animorphs, along…
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Buy on Amazon1997 · Katherine Applegate
Rachel's got some pretty strange stuff happening: she can't control her morphing. No one is sure what's going on, but Rachel and the Animorphs have…
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Buy on Amazon1997 · Katherine Applegate
Tobias, a boy who transformed into a hawk and lost the ability to return to human form, is given a chance to regain his powers. The story follows his…
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Buy on Amazon1998 · Katherine Applegate
In this 1998 novel by Katherine Applegate, Cassie and the Animorphs learn that someone has discovered proof of alien life and hidden it on the…
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Buy on Amazon1998 · Katherine Applegate
Marco accompanies the others on a dangerous underwater mission to a Yeerk facility, where the team morphs sea creatures to infiltrate the enemy's…
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Buy on Amazon1998 · Katherine Applegate
Jake and his friends discover a Yeerk website and become optimistic that they may not be alone in their fight. A 1998 novel by Katherine Applegate.
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Buy on Amazon1998 · Katherine Applegate
"What's tasty, good for you, and only takes sixty seconds to make? Oatmeal. And it's making the Yeerks more than a little crazy. Now Rachel, the…
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Buy on Amazon1998 · Katherine Applegate
Cassie, a member of the Animorphs, is exhausted from the constant battles and decides to quit the group. She can no longer cope with the…
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Buy on Amazon1998 · Katherine Applegate
The blue box Elfangor used to create the Animorphs has been found by David, who doesn't know what it is. The Animorphs must get the box at any cost,…
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Buy on Amazon1998 · Katherine Applegate
A new Animorph named David arrives as the Yeerks prepare their biggest takeover, targeting the world's most powerful leaders gathered in one place.…
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Buy on Amazon1998 · Katherine Applegate
David, the newest Animorph, is not what he appears, obsessed with controlling the other Animorphs and Ax, and his actions are starting to break up…
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Buy on Amazon1998 · Katherine Applegate
In this book by K. A. Applegate, someone claiming to be Tobias's long-lost cousin comes looking for him. Tobias is unsure whether she is telling the…
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Buy on Amazon1998 · Katherine Applegate
Cassie, the other Animorphs, and Ax face problems caused by the Helmacrons, beings less than an inch tall who believe Cassie stole their ship after…
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Buy on Amazon1999 · Katherine Applegate
This 1999 novel by Katherine Applegate is the 25th Animorphs book. When the evil Yeerks start wreaking havoc at the North Pole, Marco and the other…
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Buy on Amazon1999 · Katherine Applegate
In this 1999 Animorphs novel by Katherine Applegate, the Ellimist and his enemy the Crayak decide to settle their rivalry through a battle, each…
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Buy on Amazon1999 · Katherine Applegate
Erek is an android and one of the Animorphs' most loyal allies. He is in danger, and the only way to save him is to go deep under the ocean, more…
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Buy on Amazon1999 · Katherine Applegate
The Animorphs confront the Yeerks, who are developing a drug designed to strip humans of their free will. Despite the Yeerks' efforts, the Animorphs…
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Buy on Amazon1999 · Katherine Applegate
The 1999 novel by Katherine Applegate features the character Ax, an alien who becomes seriously ill with a virus called yamphut. His condition is…
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Buy on Amazon1999 · Katherine Applegate
Marco's mom is back, but she's no longer Visser One, and Marco isn't sure if she's still a Controller. He's determined to find out no matter what it…
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Buy on Amazon1998 · Katherine Applegate
The Yeerk that controls Jake's brother Tom is desperate to keep Tom from going with the family to his great-grandfather's funeral, even if he has to…
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Buy on Amazon1999 · Katherine Applegate
Rachel, one of the Earth teenagers dedicated to stopping the parasitic alien race known as the Yeerks, is horrified when she finds herself split into…
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Buy on Amazon1999 · Katherine Applegate
Tobias and the other Animorphs discover that the Yeerks, a parasitic alien race bent on enslaving Earth, plan to test a device that could put an end…
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Buy on Amazon1999 · Katherine Applegate
Cassie becomes entangled with the Hork-Bajir and a prophecy tied to their people's struggle against the Yeerks. When an Andalite presence stirs old…
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Buy on Amazon1999 · Katherine Applegate
Marco's mother has been infested by an alien parasite, and his father is planning to remarry. The stress puts Marco under such strain that he begins…
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Buy on Amazon1999 · Katherine Applegate
The 1999 novel by Katherine Applegate follows Jake and the other Animorphs as they attempt to stop Visser Three from reaching a Pemalite ship located…
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Buy on Amazon2000 · Katherine Applegate
When Tobias discovers Visser Three's newest feeding place, the Animorphs must decide how to proceed. A 1999 novel by Katherine Applegate.
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Buy on Amazon2000 · Katherine Applegate
The arrival of Andalites on Earth gives Ax and the Animorphs allies to fight against the Yeerk invasion but also causes new problems. A 2000 novel by…
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Buy on Amazon2000 · Katherine Applegate
The 2000 novel by Katherine Applegate follows Ax and the Animorphs as they escape the Yeerks, a alien species determined to locate the blue cube.…
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Buy on Amazon2000 · Katherine Applegate
Ax, who has always believed he is the only non-infested Andalite on Earth, discovers that there are others like him also struggling to survive until…
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Buy on Amazon2000 · Katherine Applegate
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. Written by Katherine…
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Buy on Amazon2000 · Katherine Applegate
The 2000 novel by Katherine Applegate features the Animorphs, a group of teenagers who gain the ability to morph into any animal they touch. In one…
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Buy on Amazon2000 · Katherine Applegate
This 2000 novel by Katherine Applegate is the 43rd Animorphs book. Tobias, the other Animorphs, and Ax have witnessed things no sane person would…
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Buy on Amazon2000 · Katherine Applegate
In this 2000 Animorphs novel by Katherine Applegate, Cassie is separated from the other Animorphs and finds herself alone in the rural Australian…
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Buy on Amazon2000 · Katherine Applegate
A 2000 novel by Katherine Applegate. Marco and the other Animorphs are used to fighting aliens secretly, but the Yeerk invasion is escalating, and…
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Buy on Amazon2000 · Katherine Applegate
This entry is part of the Animorphs series by K. A. Applegate, a novel later written under her name and, according to the source, ghostwritten in…
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Buy on Amazon2001 · Katherine Applegate
The battle between the Animorphs and the Yeerks has turned into all-out war. Jake, his friends, and Ax have managed to slow the Yeerks down, but the…
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Buy on Amazon2001 · Katherine Applegate
The final battle between the Animorphs and the Yeerks is underway. Jake, Rachel, Tobias, Cassie, Marco, and Ax have spent years fighting the…
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Companion & related books
Short-story collections and companion titles in this series.
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Buy on Amazon1997 · Katherine Applegate
Four kids who can morph, along with a hawk and an alien, take a break from their superhero duties to act like normal kids, but everything goes wrong…
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Buy on Amazon1999 · Katherine Applegate
Tobias and his friends, a group of young people who can morph into animals, help the alien Andalites fight the Yeerk invasion. They face a dangerous…
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Buy on Amazon1997 · Katherine Applegate
In this 1997 novel by Katherine Applegate, Elfangor-Sirinial-Shamtul is an Andalite war-prince who gave five young humans the ability to morph into…
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Buy on Amazon1998 · Katherine Applegate
Aldrea, a young member of the outpost the Andalite race has placed on the planet of the Hork-Bajir, must help her native friend Dak when the…
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Buy on Amazon1999 · Katherine Applegate
On trial for treason, Edriss 562 recounts how she infested a series of human hosts to spearhead the invasion of Earth by her people, the ruthless,…
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Buy on Amazon2001 · Katherine Applegate
"Really Big Trouble" is a 2001 novel by Katherine Applegate. The story follows the Animorphs, a group of teenagers who have the ability to morph into…
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Buy on Amazon2000 · Katherine Applegate
Jake, Rachel, Tobias, Cassie, and Marco live a normal life when the Animorphs never existed. They no longer have the ability to morph or fight the…
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Buy on Amazon2000 · Katherine Applegate
The Elimist Chronicles is a 2000 novel by Katherine Applegate in the Animorphs series. Much of the series was ghostwritten by other authors using…
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Buy on Amazon2001 · Katherine Applegate
Marco confronts a grim mission requiring a hard sacrifice, while the team weighs how far they will go to win the war. Difficult choices test the…
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Buy on Amazon2000 · Katherine Applegate
A 2000 novel by Katherine Applegate. The Animorphs and Ax must decide whether to keep fighting the Yeerks in secret or reveal their existence and the…
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Buy on Amazon2001 · Katherine Applegate
The Yeerks take over units of the National Guard, planning to infest all its officers and soldiers as a step toward war on Earth. The Animorphs,…
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Buy on Amazon2000 · Katherine Applegate
The Yeerks discover that the Andalite Bandits are actually humans, not aliens. This revelation forces Tobias and the other Animorphs to change their…
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Buy on Amazon2000 · Katherine Applegate
Rachel is captured by David, the sixth member of the Animorphs, who was once stranded on a deserted island. He has returned and seeks revenge. This…
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Buy on Amazon1998 · Katherine Applegate
Ax and the Animorphs face a dangerous situation when they decide to morph into mosquitoes to avoid some Yeerks. While attempting to slip past their…
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Frequently asked questions
What order should I read the Animorphs books in?
Publication order — Widely recommended by readers and matching Scholastic's numbered 1-54 release sequence Start with “The Invasion.”
How many books are in the Animorphs series?
We list 61 books by Katherine Applegate , published between 1996–2001.
Where can I buy the Animorphs books?
Each title above links to Amazon. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
Reading order compiled from author/publisher guidance and verified bibliographic data. Spotted an error? We continuously correct the catalog.