There are 54 books in the Animorphs series. The newest book is The Beginning .

1
The Invasion

Book cover of The Invasion
The Earth is being invaded, but no-one knows about it. When Jake, Rachel, Tobias, Cassie and Marco stumble upon a downed alien spaceship and its dying pilot, they're given an incredible power they can transform into any animal they touch. With it, they become Animorphs, the unlikely champions in a…
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2
The Visitor

Book cover of The Visitor
Rachel and her friends have been given the power to morph into any animal they touch. So when Rachel starts to suspect that one of her school friends has fallen into the control of the evil Yeers, she knows just the way to find out the truth.

3
The Encounter

Book cover of The Encounter
The wildly popular books by K.A. Applegate are back! The Animorphs return in this update of the classic series.

When Tobias and his friends were given the power to morph, they were also given an important warning: Never stay in a morph for more than two hours. But Tobias broke…

4
The Message

Book cover of The Message
The wildly popular books by K.A. Applegate are back! The Animorphs return in this update of the classic series.

It all started with the dreams. But Cassie didn't pay much attention to them. She and her friends have been having nightmares ever since they acquired the power to morph. But…

5
The Predator

Book cover of The Predator
The wildly popular books by K.A. Applegate are back! The Animorphs return in this update of the classic series.

Marco never wanted to be an Animorph. He didn't want the ability to change into any animal he touches. And he certainly didn't want to be one of a handful of…

6
The Capture

Book cover of The Capture
The wildly popular books by K.A. Applegate are back! The Animorphs return in this update of the classic series.

It was bad when Jake found out his brother was one of them. A Human-Controller. A slave. But that was nothing compared to this.When the Animorphs decide to visit the Yeerks'…

7
The Stranger

Book cover of The Stranger
The wildly popular books by K.A. Applegate are back! The Animorphs return in this update of the classic series.

Rachel isn't the kind of girl who backs away from a fight. When her dad asks her to move across the country with him, it hurts, but Rachel won't desert her…

8
The Alien

The Alien
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

9
The Secret

The Secret
As the Yeerks close in on their hideout, the Animorphs realize that they have no choice but to fight, and Cassie plans to outsmart the enemy with the help of a cool but smelly new morph. Original.

11
The Forgotten

The Forgotten
Discovering a crashed Yeerk Bug fighter, Tobias quickly alerts the Animorphs so that they can use the fighter to prove that the earth has been invaded, but the Yeerks retaliate by transporting the Animorphs to another time. Original.

12
The Reaction

The Reaction
When Rachel's morphing spins out of control, transforming her into a variety of animals against her will, Ax figures out that she is allergic to her crocodile morph, and the companions must try to keep Rachel from attracting unwanted attention. Original.

13
The Change

The Change
Unable to return to his human form after morphing into a red-tailed hawk, Tobias is assisted by an Ellimist in changing his form into other animals and wonders if he will ever be a human again. Original.

14
The Unknown

The Unknown

There's a new rumor in town. Someone has discovered an item that proves life on other planets exists, and they've been hiding it on a base called Zone 91, the most secret place on Earth. 

Cassie and the other Animorphs already know about life on other planets. Too well. Their…

15
The Escape

The Escape
Investigating Visser One's secret underwater project, Marco and the other Animorphs find out that his mother is their worst enemy--the leader of the Yeerk invasion of Earth. Original.

16
The Warning

The Warning
Jake discovers a Web site about the Yeerks, but if he investigates, it may be a trap, and if he does not, the Animorphs will never know if there are others who are fighting their enemies. Original.

17
The Underground

The Underground
Rachel, the other Animorphs, and Ax have discovered a new super weapon against the Yeerks--instant oatmeal--and they must make a trip down to the Yeerk pool to use it and slow down the invasion. Original.

18
The Decision

The Decision
Sent on another mission to stop the evil Yeerks, Ax and the Animorphs decide they will be most effective if they morph into tiny mosquitoes, but before they know it, they are trapped in the unimaginable realm of Zero-space. Original.

19
The Departure

The Departure
When Cassie tires of the missions and secrecy of being an Animorph, she tries to quit, but a human-controller discovers her secret and threatens the Animorphs' existence. Original.

20
The Discovery

The Discovery
When he stumbles on the blue box used to create the Animorphs--the shape-shifting animal-humans--David determines to become the most powerful Animorph of all before Marco catches him and turns him over to the Yeerks. Original.

21
The Threat

The Threat
David, the new Animorph, at first proves to be a valuable warrior, but eyebrows are raised when he starts taking risks and breaking rules that could get the Animorphs discovered. Original.

23
The Pretender

The Pretender
Attending the reading of his father's will, Tobias learns that his father was really the Andalite Prince Elfangor, but he is unable to reveal what he has discovered because of the continual presence of Visser Three.

24
The Suspicion

The Suspicion
Cassie and her Animorph companions meet a treacherous new enemy, the Helmacrons, tiny but unexpectedly lethal invaders who have the ability to shrink others to their size and who are taking hostages to recover their spaceship.

25
The Extreme

The Extreme
When the evil Yeerks start wreaking havoc at the North Pole, Marco and the other Animorphs must use their special powers to stop them from taking over one of the coldest places on Earth.

26
The Attack

The Attack
In what is supposed to be a battle to end all battles, the Animorphs are chosen by the Ellimist to face the Crayak's dreaded Howlers. Original.

27
The Exposed

The Exposed
The Animorphs must use a giant squid morph to rescue their android friends the Chee, who are stuck in a deep trench on the ocean floor, and they have to get there before Visser Three does.

28
The Experiment

The Experiment
The Yeerks are working on a drug that saps humans of their free will but the Animorphs show them that human free will runs deeper than any drug can reach.

29
The Sickness

The Sickness
When the Animorphs' alien friend Ax comes down with a virus that could be deadly, they need to come up with a plan to get him well again that does not involve a hospital. Original.

31
The Conspiracy

The Conspiracy
While at a meeting of The Sharing, Jake's father is threatened with Yeerk infestation at the hands of his own son, yet when Jake acts on a plan to help his father, his brain suddenly locks up and leaves him helpless at a very crucial time. Original.

32
The Separation

The Separation
Rachel has a strong personality. But it's not strong enough for two people. And now that's the situtation. When thatlittle boy on the beach cut a starfish in two with his spade, he had no idea what he'd done...Now the Animorphs have anew member - or is that two new…

33
The Illusion

The Illusion
Discovering that the Yeerks possess a weapon that can transform an Animorph back to a normal person with the flick of a switch, the Animorphs are forced to find a way to destroy their secret tool quickly or risk having their secret identitites exposed to all. Original.

34
The Prophecy

The Prophecy
Cassie acquires the mind of Aldrea, daughter of Seerow, Andalite Prince, as well as her memory, persona, secrets, and an abundance of valuable information that will help the Animorphs. Original.

35
The Proposal

The Proposal
As the Yeerks step up their invasion tactics, Marco must deal with his own problems at home when his father begins dating even though Marco believes his mother may still be alive. Original.

36
The Mutation

The Mutation
The best-selling author of ANIMORPHS and EVERWORLD presents a fresh, exciting, and gritty new science-fiction series that combines a little 2001, a little Armageddon, and a whole lot of a action!

Caught in the bowels of their strange new world, Mo' Steel and Billy Weir encounter a lost Remnant, Kubric…

37
The Weakness

The Weakness
When Tobias discovers a new alien feeding place while Jake is away, he and the other Animorphs determine to do something about it, but without a designated leader they find the project more difficult than they expect.

38
The Arrival

The Arrival
The arrival of Andalites on Earth gives Ax and the Animorphs allies to fight against the Yeerk invasion but also causes new problems.

39
The Hidden

The Hidden
The Yeerks plan to use the Helmacron ship they have repaired to capture the Andalites and track down Elfangor's blue cube--the cube that gives Cassie, and the other animorphs the ability to morph