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
Five ordinary kids take a shortcut through an abandoned construction site and witness a dying alien crash-land his ship. Before he perishes, the…
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Buy on Amazon1996 · Katherine Applegate
Rachel grows suspicious that the assistant principal at school is a high-ranking Yeerk, and that his daughter may be an innocent caught in the…
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Buy on Amazon1996 · Katherine Applegate
Tobias, trapped in the body of a hawk, struggles with his fading humanity while the team uncovers a Yeerk scheme involving a hidden mountain lake. As…
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Buy on Amazon1996 · Katherine Applegate
Jake and Cassie begin sharing strange dreams that seem to call to them from beneath the ocean. The visions point to a survivor of the Andalite ship,…
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Buy on Amazon1996 · Katherine Applegate
Marco wrestles with whether to keep fighting, especially after learning something that hits painfully close to home. When the group is captured and…
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Buy on Amazon1997 · Katherine Applegate
Jake is taken by force and infested by a Yeerk, giving readers a chilling look at what it feels like to lose control of your own body. As the slug…
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Buy on Amazon1997 · Katherine Applegate
Rachel and the others discover a hidden Yeerk operation beneath a shopping mall, and an encounter with a mysterious, godlike being called the…
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Buy on Amazon1997 · Katherine Applegate
Ax, the young Andalite stranded on Earth, takes center stage as he balances loyalty to his own people with his growing bond to his human friends.…
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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
The team encounters an android named Erek, a member of a peaceful ancient alien race called the Chee who have been hiding on Earth for thousands of…
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Buy on Amazon1997 · Katherine Applegate
Jake is hurled through time and finds himself in a strange future where the war against the Yeerks has taken an unexpected turn. Struggling to…
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Buy on Amazon1997 · Katherine Applegate
Cassie's morphing power begins malfunctioning, causing her to involuntarily transform at the worst possible moments. As the team investigates the…
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Buy on Amazon1997 · Katherine Applegate
Tobias is given a fateful choice by the Ellimist that could change his nature and his future. As the team learns more about the Yeerks' plans and an…
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Buy on Amazon1998 · Katherine Applegate
While investigating a secret Yeerk operation hidden near a desert tourist trap, the team goes undercover among wild horses. Cassie narrates as 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
The team discovers that the Yeerks are using the internet to recruit and manipulate humans into joining their cause willingly. Tobias and the others…
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Buy on Amazon1998 · Katherine Applegate
The Animorphs discover that a substance affecting Yeerks could become a powerful weapon, sending them deep into the Yeerk pool beneath the city. Jake…
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Buy on Amazon1998 · Katherine Applegate
Ax and the team are accidentally flung into Zero-space during a mission, leaving them stranded far from Earth. Cut off from home, the Animorphs must…
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Buy on Amazon1998 · Katherine Applegate
Cassie, exhausted by the moral weight of the war, walks away from the team to be alone in the woods. There she meets a young girl with a hidden…
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Buy on Amazon1998 · Katherine Applegate
An Andalite device with the power to alter reality falls into human hands and ends up in the possession of a boy who has no idea what he holds. Marco…
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Buy on Amazon1998 · Katherine Applegate
The Yeerks unleash a ruthless new human-Controller named David, and the team faces a fresh recruit of their own whose loyalty is dangerously…
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Buy on Amazon1998 · Katherine Applegate
The conflict over the dangerous new Animorph reaches a breaking point, forcing the team to make a terrible decision. Cassie's compassion clashes with…
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Buy on Amazon1998 · Katherine Applegate
Tobias learns startling truths about his own family and origins, including a connection that ties him more deeply to the war than he realized. As the…
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Buy on Amazon1998 · Katherine Applegate
A second, microscopic alien threat called the Helmacrons arrives on Earth aboard a tiny spaceship, and they shrink the Animorphs down to fight for…
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Buy on Amazon1999 · Katherine Applegate
The team discovers a Yeerk base hidden in a frozen wilderness and must endure brutal cold to investigate the enemy's plans. Marco leads a high-stakes…
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Buy on Amazon1999 · Katherine Applegate
The Animorphs are drawn into a conflict involving the Ellimist's ancient enemy, Crayak, and a being known as the Howlers. Whisked away to fight in a…
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Buy on Amazon1999 · Katherine Applegate
Tobias and Marco get tangled up with a daredevil television crew while a Yeerk plan threatens disaster beneath the ocean. The team must protect their…
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Buy on Amazon1999 · Katherine Applegate
The Yeerks develop a plan involving a fast-food company and a substance that could give them a powerful advantage. Jake and the team go undercover to…
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Buy on Amazon1999 · Katherine Applegate
Ax falls gravely ill from an Andalite affliction at the worst possible time, just as a crisis unfolds in the Yeerk pool. Cassie must lead the team…
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Buy on Amazon1999 · Katherine Applegate
Marco confronts agonizing personal stakes as the war draws closer to his own family. Forced to choose between the mission and the people he loves, he…
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Buy on Amazon1999 · Katherine Applegate
When a family event threatens to expose the team, Jake faces the danger that the Yeerks may be closing in on his loved ones. The conflict grows…
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Buy on Amazon1999 · Katherine Applegate
A bizarre accident in the ocean splits Rachel into two separate people, each embodying a different side of her personality. As her reckless half and…
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Buy on Amazon1999 · Katherine Applegate
Tobias is captured and subjected to brutal interrogation by the team's enemies, who try to break him and learn the Animorphs' secrets. As he endures,…
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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 secret life nearly unravels when his father plans to remarry and move away, threatening the cover that keeps the Animorphs hidden. Meanwhile…
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Buy on Amazon1999 · Katherine Applegate
Jake and the team venture deep beneath the ocean and encounter a strange undersea world tied to the Yeerks' expanding ambitions. The mission reveals…
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Buy on Amazon2000 · Katherine Applegate
With Jake sidelined, Rachel takes command of the team, but her aggressive instincts are tested when the Yeerks exploit a moment of weakness in the…
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Buy on Amazon2000 · Katherine Applegate
A group of Andalites arrives on Earth, but their methods and intentions raise unsettling questions for Ax and the team. As the newcomers pursue their…
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Buy on Amazon2000 · Katherine Applegate
During a mission, Rachel acquires a unique animal and the team becomes entangled with a Hork-Bajir while evading the Yeerks in the wilderness. The…
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Buy on Amazon2000 · Katherine Applegate
Ax and Tobias encounter two other Andalites living secretly on Earth, raising new questions about who can be trusted. As the team investigates, they…
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Buy on Amazon2000 · Katherine Applegate
Jake is thrown into a disturbing future where the Yeerks have conquered Earth and humanity has been enslaved. Trapped in this nightmarish world and…
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2000 · Katherine Applegate
The Helmacrons return, once again shrinking down to wreak havoc as they pursue their own bizarre goals. Marco and the team must deal with the…
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Buy on Amazon2000 · Katherine Applegate
Tobias is lured into a confrontation tied to the dangerous human-Controller Taylor, who manipulates him into a plan against the Yeerks. As the scheme…
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Buy on Amazon2000 · Katherine Applegate
Marco finds himself stranded far from home and caught up in an unexpected adventure involving an alien threat the team didn't see coming. With his…
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Buy on Amazon2000 · Katherine Applegate
Ax takes the lead as long-held secrets about the Andalites and the war come to light, shaking his faith in his own people. The revelations force the…
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Buy on Amazon2000 · Katherine Applegate
Ax uncovers a Yeerk plot involving a human military vessel that could tip the balance of the war. Infiltrating the operation, he must navigate human…
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Buy on Amazon2000 · Katherine Applegate
The free Hork-Bajir colony in the mountains comes under threat, and the team must defend their hidden allies from discovery. Jake leads the effort to…
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Buy on Amazon2000 · Katherine Applegate
Tobias confronts painful matters of family and identity as the war's pressures mount, including encounters with figures from his past. The personal…
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Buy on Amazon2001 · Katherine Applegate
With the Yeerks closing in on the team's identities, the Animorphs scramble to protect their families from being targeted. Jake must orchestrate a…
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Buy on Amazon2001 · Katherine Applegate
As the war escalates toward its climax, the team faces growing exposure and a powerful new development in the conflict. The Animorphs must adapt…
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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 Amazon2001 · Katherine Applegate
With the war nearing its end, the team prepares to take the fight directly to the heart of the Yeerk operation. Jake must make impossible decisions…
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Buy on Amazon2001 · Katherine Applegate
In the series finale, the long war against the Yeerks reaches its decisive battle and its aftermath. The Animorphs face the ultimate cost of…
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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
In this first Megamorphs adventure, the whole team faces a powerful alien threat called the Veleek that hunts them across the city. The danger pulls…
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Buy on Amazon1998 · Katherine Applegate
This companion volume tells the origin story of the Hork-Bajir, a gentle alien people whose peaceful world is invaded by the parasitic Yeerks. It…
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Buy on Amazon1999 · Katherine Applegate
Told largely from the perspective of the Yeerk leaders, this companion book reveals the rivalry between Visser One and Visser Three and the early…
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Buy on Amazon2000 · Katherine Applegate
This companion volume tells the epic life story of the Ellimist, the near-omnipotent being who guides the Animorphs from afar. It traces his journey…
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Buy on AmazonYear unknown · Katherine Applegate
In this Megamorphs story, the Drode grants Jake's unspoken wish that he had never become an Animorph, erasing the moment the team gained their…
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Buy on AmazonYear unknown · Katherine Applegate
In this Megamorphs adventure, the team is pulled back through history when the Yeerks attempt to alter the outcome of World War II. The Animorphs…
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Buy on AmazonYear unknown · Katherine Applegate
This companion book recounts the history of Elfangor, the Andalite who gave the kids their powers, long before he came to Earth. It follows his…
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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 53 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.