Including the ‘companion’ books that flesh out the backstory and lore in important ways, there are sixty-two Animorphs books in total. Granted, these are slim volumes that you can smash out in a couple of hours, but even so, taking on this series is a commitment. Especially given that they’ve been largely out of print for twenty years - while the eBooks are available for free online and there’s an ongoing graphic novel adaptation, tracking down the entire series can be a difficult and expensive proposition.
But the thing about having that many books is that not all of them are necessary or even, frankly, good. The second half of the series is packed with filler novels that either stall or actively damage development, and so the best way to read this series (which remains very, very worth doing) is to be a little judicious in which books you read and which ones you ignore. You can read less than half the Animorphs books and still have a great time. Possibly an even better one.
So which books do you absolutely need to read, which ones can you skip, and which ones fall somewhere in the middle? Below is my assessment of every Animorphs book in release order.
Essential: Advances the plot, themes or characters in crucial ways.
Recommended: The series works fine without it, but there’s worthwhile stuff here.
Skippable: You have little or nothing to be gained from reading this book.
1. The Invasion – Essential
Jake, Rachel, Cassie, Tobias and Marco learn of a secret invasion and are given the power to morph by a dying alien. Sets up the world and characters with fast paced efficiency and a tight, propulsive structure. A great introduction which hides in plain sight all the big themes and ideas that will come to dominate the series.
2. The Visitor – Recommended
Rachel investigates her friend’s Controller father. Some good character development for Rachel and further establishment of the stakes, but doesn’t do anything that later books don’t do better. Plus, in these early books the climax is almost always the same and will start to grate after a while.
3. The Encounter – Essential
Tobias struggles with being trapped in the body of a hawk. Doesn’t really progress the plot, but in terms of both theme and character the series is poorer without it. The deeper, more ambivalent ideas about identity that Animorphs got very good at exploring really start to take hold here and even by the end of the series this remains one of the strongest examples of that.
4. The Message – Essential
The Animorphs rescue trapped Andalite Ax from the ocean. Not nearly the best book in the series, and a little repetitive in terms of plot beats, but crucial plot-wise – Ax is a great character and you can’t miss his introduction.
5. The Predator – Essential
The Animorphs go to space and learn the identity of Visser One. Great character and world building plus a game changing twist essential to the series going forward. In hindsight one of the most pivotal books in the series and the beginning of one of its most wrenching, nail-biting arcs.
6. The Capture – Essential
Jake becomes a controller. Do not read Animorphs and not read this book. Fantastic world building, effective exploration of stakes and a great central dilemma. Like The Encounter it doesn’t exactly advance the overall plot but lends so much depth you really can’t miss it – along with some creepy foreshadowing for what is to come. One of the earliest hints that the story Animorphs is telling is much, much bigger that what you might initially assume.
7. The Stranger – Essential
A cosmic being called The Ellimist gives the Animorphs the choice to continue fighting a battle they’ll lose or to escape with their loved ones to a safe planet and abandon Earth to its fate. Another major player introduced, plus a great dilemma, some nice worldbuilding and a big series turning point. The resolution is both surprising and satisfying while economically setting up another major running thread that will be properly examined way down the line.
7.5. Megamorphs #1: The Andalite’s Gift – Recommended
The Animorphs are hunted by a creature who can sense morphing. A fun blast of blockbuster action after a succession of heavy books and a great wrap to the series’ first act. Like all of the Megamorphs books you don’t need to read it exactly, but unlike the other Megamorphs books it’s just so much fun and really reads as a chance to go on a rollicking, chase adventure with these characters. No heaviness here but no irritating silliness either. If Animorphs was ever made into a sanded down Hollywood movie that avoided all the darkness, this would be the place to start.
8. The Alien – Essential
Ax attempts to make contact with his home world. Adds shades to both a central character and major villain, while fleshing out the series backstory in clever, crucial ways. Just a great read packed with fascinating detail, humour and heart. In retrospect the early run of the series is across the board its most consistent and this is a highlight.
9. The Secret – Skippable
The Animorphs try to stop the Yeerks from using a logging operation as a front to smoke them out. Doesn’t really progress the plot and has a goofy as hell ending, but plays with some interesting ethical dilemmas especially as pertains to Cassie’s empathetic environmentalism and Tobias’ new nature as a predator who has to kill to survive. But really, that’s about it and on its own not enough to recommend it.
10. The Android – Essential
The Animorphs discover they have allies in a peaceful race of Androids called the Chee. More major new players and worldbuilding, plus some serious darkness towards the end. That said, this also marks the first significant time the Animorphs make a choice that will have you yelling at the book wondering what the hell they were thinking, especially come later books.
11. The Forgotten – Skippable
The Animorphs get trapped in the Amazon twelve hours in the past. Fitting title for a story that literally retcons itself at the end. Adds a bit of depth to Jake, but not enough to justify its own existence. It’s a struggle to remember anything specific from this book.
12. The Reaction – Skippable
Rachel has an allergic reaction to a morph and loses control. Kind of fun, but silly and weightless. Probably don’t bother.
13. The Change – Essential
The Ellimist offers Tobias his morphing powers back in exchange for helping to rescue two escaped Hork Bajir. A game changer in more ways than one. Unmissable. I don’t think there’s a single Tobias book that I would recommend skipping, but this is the biggest of all of them in terms of the new elements it introduces.
13.5. The Andalite Chronicles – Essential
The full story of how Elfangor ended up on earth. Integral backstory, gut punch tragedy and fantastic sci-fi pulpiness. Not quite Animorphs at its absolute best (that would be the next Chronicles) but a great read that enriches the entire series and provides crucial context for what is to come, while also turning Elfangor from a benevolent saviour into someone a bit more complicated with key parallels to the Animorphs themselves.
14. The Unknown – Skippable
The Animorphs attempt to infiltrate a government base and learn what alien technology they’re hiding. Turns out, a toilet joke and far from the first in this book. Decide for yourself if that’s for you or not.
15. The Escape – Recommended
The Yeerks attempt to turn hammerhead sharks into Controllers to invade an underwater planet. Builds on previously established plot points and in the moment progresses things only slightly, but is important for forthcoming events.
16. The Warning – Recommended
The Animorphs learn of a Yeerk serial killer. Not integral to the overall plot, but a great encapsulation of how far our central characters have sunk morally with a deeply troubling final choice and a chilling ending that refuses to give comfortable answers. One of the first hints that maybe the Animorphs are not really heroes.
17. The Underground – Skippable
Oatmeal turns out to be a Yeerk drug and the Animorphs decide what to do about it. An interesting enough central dilemma, if completely ridiculous, but it’s not explored in a way that makes the most of it.
18. The Decision – Recommended
The Animorphs end up in the midst of the battle for an alien planet. I highly recommend this one for its world building and for Ax, but you won’t lose a huge amount without it. It’s super enjoyable and if like me you love the lore of this world then this book has heaps to offer, but I think it only comes up again like, once, and vaguely at that.
18.5. Megamorphs #2: In the Time of Dinosaurs – Recommended
An attempt to rescue a nuclear sub blows the Animorphs back to the Cretaceous Period. Inherently silly and inessential, but with a third act moral dilemma that’s genuinely knotty and a hugely upsetting finale. It’s scuppered a little bit by only rarely coming up again and having no tangible impact on the characters going forward, but despite fan dislike it’s a hugely enjoyable read and I defy you to get through the final pages still feeling okay about, well, anything.
19. The Departure – Essential
Cassie is stranded in a forest with an injured Yeerk controller who knows her secret. Ooh boy, is this a great read. Effectively a two-hander morality play that finally gives us a sympathetic Yeerk perspective and complicates everything the Animorphs considered to be straightforward. Let down by a way too convenient ending, but an absolute highlight all the same, and one that turns out to be integral to the series’ resolution.
20. The Discovery – Essential
When a student at their school discovers the Morphing Cube and becomes a target of the Yeerks, The Animorphs must decide whether to recruit him or leave him to his fate. The start of a three-book arc, this is very much a first act but given what it sets up you can’t not.
21. The Threat – Essential
The Animorphs acclimate to their new member. The second act in a story, it has an absolutely horrifying cliff-hanger ending – as a kid I never read the third part and it haunted me for years. The last third of the book is pulse-pounding stuff that turns our understandings of the characters’ roles within the team on its head and brings to light burgeoning ideas that have so far hidden in plain sight.
22. The Solution – Essential
The Animorphs try to deal with a uniquely dangerous enemy – one of their own. Holy crap, what a resolution. This book is packed full of twists and genuine surprises. And the ending is one of the most unsettling moments in a series full of unsettling moments. This trilogy is Animorphs at its bleak, uncompromising, fiercely intelligent best. Some of these books are slogs, some are easy if not especially propulsive reads and some are absolute page turners. This exemplifies the last type and then some.
22.5. The Hork Bajir Chronicles – Essential
The full backstory of how the Yeerks took over the Hork Bajir and the futile guerrilla efforts to stop them. Oh man. Oh man, oh man, oh man. When people try to laugh off Animorphs, this book is the only rebuttal necessary. A devastating sci-fi parable about the costs and complexities of war that also serves as a parallel for the main books. It shows where the war started and where, in the worst case scenario, it could go. Deserves to be a classic even without the rest of the series. Brilliant.
23. The Pretender – Essential
Tobias discovers that a cousin he’s never met wants to take him in, leading to him learning the truth about his parentage. Not only is it a game changer, but it has some of the best writing of the series with some powerful reflections on humanity, morality and identity. The plot surrounding the big revelation and Tobias’ development is kind of flimsy, but like most Tobias books that development alone is worth it and then some.
24. The Suspicion – Skippable
The Animorphs deal with a race of miniature aliens bent on world domination. Funny at times but very silly and does absolutely nothing to progress the plot. Probably necessary after a few gut punches in a row, but still, not exactly top-tier stuff.
25. The Extreme – Skippable
The Animorphs head to the North Pole to destroy a Yeerk base. This one is disposable, but it’s also pretty fun with some edges of darkness peppered throughout. Quick to breeze through, won’t leave a lasting impression, but won’t emotionally devastate you either. If you want pure entertainment from your Animorphs, you can do a lot worse.
26. The Attack – Essential
The Ellimist enlists the Animorphs as his champions to save an alien race from his rival. This is one of the most satisfying books in the whole series, hands down. Not only does it show the full scope of what’s at stake, not only does it offer real glimmers of hope, but it’s also just a cracking read with brilliant twists, great world building and punch-the-air moments. All in something like 25,000 words. Brilliant.
27. The Exposed – Skippable
When their android allies the Chee begin malfunctioning, the Animorphs have to find a way to reach their submerged ship and fix them. Introduces an interesting new player and furthers Rachel’s internal struggle with her own nature (along with her relationship with Tobias), but as a story it’s not a standout and ultimately is a bit wheel spinning.
28. The Experiment – Skippable
The Animorphs investigate a Yeerk experiment at a slaughterhouse. Maybe one of the most pointless books in the whole series. Some funny Ax material, but even the feints at moral ambiguity feel half-hearted. Plus the ghostwriting is super obvious. Profoundly unnecessary.
29. The Sickness – Essential
When Ax comes down with an alien illness that quickly spreads to the other Animorphs, Cassie is forced to work alone to rescue an unlikely ally. A sequel of sorts to The Decision, this develops what that book set up, establishes the Yeerk Peace Movement and goes to some moving places. A great read with some decent plot progression.
29.5. Megamorphs #3: Elfangor’s Secret – Recommended
When Visser Four finds the time Matrix and attempts to change human history the Animorphs are enlisted to stop him. This book is a mixed bag. One of my favourites as a kid, it’s a brutal exploration of humanity’s affinity for war with a lot of shocking moments and big ideas, but it’s let down by a heavy ending that, for once, rings hollow due to the Animorphs having several obvious better choices. 90% of a great read, but doesn’t quite hit ‘essential’ status.
30. The Reunion – Essential
Marco discovers that his Yeerk controller mother is on the run from the Yeerks. A great book for Marco that explores his growing ruthlessness and how it comes into conflict with his mother’s plight. Let down a little by slightly loose plotting and a couple of leaps in logic, but includes some fairly major plot progression and sets up big things to come.
31. The Conspiracy – Skippable
Jake attempts to stop his Yeerk controller brother from killing their father. Nothing in this book is exactly necessary, but it’s worth the read for its gripping cat-and-mouse games, tough moral dilemmas, and well-considered reflections on what war does to people.
32. The Separation – Skippable
After being cut in half in starfish morph, Rachel regenerates into two versions of herself with different personalities. Fans hate this book but I found it kind of fun. I laughed a bunch and it was nice to have Applegate back at the wheel after a few ghost-written books. It’s also a decent character study of Rachel. But in terms of necessity to the series, you can easily skip it.
33. The Illusion – Essential
As part of a ploy to find and destroy a Yeerk weapon, Tobias allows himself to be captured. Oh man this book hits hard. It’s dark as all hell and a seriously troubling read – it’s essentially Tobias being tortured, a lot – but there are moments of power and beauty here too. If you’re being incredibly ruthless with your read then I can’t say that it’s entirely necessary, but for Tobias’ arc and just straight up great writing, I’m going to give it the ‘essential’ rating.
34. The Prophecy – Recommended
In order to help the Hork Bajir take back their home world, Cassie has to let herself be inhabited by the essence of a long-dead Andalite hero with crucial information. Basically a sequel to The Hork Bajir Chronicles, this book continues that one’s tradition of breaking your heart and also being an exceptional read. This is emotional, thought provoking, packed with moral ambiguity. An absolute winner even if its events never come up again.
35. The Proposal – Skippable
Marco struggles with his father’s new relationship. A week or so after finishing this I could barely remember what happened in it. There’s some very minor plot progression in Marco’s father remarrying, a cliff-hanger at the end that sets up Visser, and some great jokes at the band Hanson’s expense, but otherwise this is totally disposable.
35.5. Visser – Essential
Visser One is put on trial and the origins of the Yeerk invasion are explored. For the first half, this is A-grade Animorphs with excellent worldbuilding and some brilliant twists, turns and sci-fi ideas, but it comes apart a bit as it goes, becoming borderline confusing and gradually feeling less and less vital. Still, it features the first real ‘reunion’ between Marco and his mother and some long awaited answers to big questions which nicely establish the stakes going forward.
36. The Mutation – Skippable
A mission to destroy a new Yeerk ship leads the Animorphs to a nightmare Atlantis. Some creepy imagery and cool ideas, but this late in the game books like this just aren’t needed. It doesn’t do anything other books haven’t done better and, while entertaining, is ultimately forgettable.
37. The Weakness – Skippable
Jake leaves town and Rachel leads the group on a series of reckless attacks. Obvious ghost-writing and weird characterisation do Rachel a massive disservice here, resulting in a book that’s neither enjoyable nor important. Probably the worst in the series. Just don’t.
38. The Arrival - Recommended
The arrival of an Andalite hit squad divides the Animorphs. Such a great book – tense, unpredictable, with a cracking central mystery and a fantastic encapsulation of how far Ax has come and how low the Andalites have sunk. It doesn’t exactly progress the overall plot, but it’s so damn good that you’d be remiss to skip over it; one of those books that captures everything awesome about Animorphs, and a great palate cleanser after the atrocious previous one.
39. The Hidden – Recommended
Cassie accidently gives morphing powers to a buffalo. This book has a Rick and Morty-esque way of taking a silly sci-fi idea and pushing it to its most nightmarish, horrible extreme. There are plot holes and logic leaps, which is hardly unique at this point in Animorphs’ run, but it manages to make you invest in this whole buffalo situation and the resolution is heartbreaking, if a bit too convenient. Plus the whole book is essentially a nonstop chase that is pretty top-to-bottom stressful.
40. The Other – Skippable
The Animorphs discover more Andalites are hiding out on earth. Uncharacteristically for an Andalite heavy book, not a lot of any note happens here in terms of progression, worldbuilding, or interesting ideas. It’s sweet natured and a good Marco book, but apart from revealing that Ax (and the whole Andalite culture) is deeply ableist, there just isn’t enough here to make it feel that vital this late in the game.
40.5. Megamorphs #4: Back to Before – Recommended
A war weary Jake makes a deal to change the past and stop the Animorphs ever getting their powers – or learning about the war. Despite being predicated on a somewhat out-of-character judgement lapse for Jake, this is a great ‘what if’ story that, due to its nature as a parallel timeline, becomes quite gripping and unpredictable while shedding new light on the characters. It’s not crucial to the plot, but it’s so damn enjoyable and shows how far everyone has come while highlighting that the seeds of their individual journeys have been in place from the start. It also implicitly answers several questions that, this many books in, readers are likely to start asking – such as why the Animorphs don’t use Ax to go public and reveal the invasion to the world.
41. The Familiar – Recommended
After a particularly rough mission, Jake wakes up in a future where the Yeerks have won. This book is… weird. Especially coming immediately after one with a very similar plot and point. But they’re differentiated by the fact that this is effectively what would happen if David Lynch wrote an Animorphs book. The potential future is deliberately inconsistent and punctuated with bursts of bizarre dreamlike imagery; children sitting in an underground tree singing, the ghosts of everyone Jake killed coming for him, a devilish hybrid of Tobias, Elfangor and Ax. It ends with the hint of another powerful player out in the universe, but is never followed up on. It is completely unnecessary to the overall story, but it’s more memorable than plenty of books that are, even if it doesn’t entirely work.
42. The Journey – Skippable
The Helmacrons invade Marco’s body, forcing the Animorphs to shrink and stop them. Okay so weirdly I enjoyed this way more than the previous Helmacrons book. I laughed out loud at several points and no matter how goofy the plot is, there’s fun to be had here. But it’s another late-stage book that doesn’t even pretend to advance the plot or characters, so I can’t exactly recommend it.
43. The Test – Recommended
Tobias struggles with the aftermath of his torture when the Animorphs make a deal with the Yeerk responsible. Like all Tobias books, this is thought provoking, moving and a shining example of why Animorphs retains such a passionate adult fan base. It’s effectively a direct sequel to The Illusion and is predominantly concerned with Tobias coming to terms with not only the events of that book, but also the fact that he may have deliberately chosen to get stuck as a hawk. Important for his character and powerful in how it gently articulates that sometimes we never find a real answer to the things that torment us, but it doesn’t move much forward.
44. The Unexpected – Skippable
Cassie contrives her way to a solo adventure in Australia. So look, it’s not great. But it’s not terrible either. This is one of those books that knows what it is and owns it; if you’re coming to Animorphs purely for the silly adventure stuff, then it’s fine. But let’s be real; nobody in the 2020s is coming to this series for the silly adventure stuff. I was perfectly diverted but knowing big plot is right around the corner didn’t do a heap to endear this book to me.
45. The Revelation – Essential
When Marco’s father becomes a Yeerk target, the Animorphs are forced to reveal the truth – and everything changes. Man, after so many books of not very much happening, to have one with this many game changers packed in is nothing short of exhilarating. So many major plot threads come to a head here. The status quo is blown to pieces by the end and you’re left with the sense that the series’ final act has well and truly begun. On top of all that it still manages to pack in humour, heartbreak, a gut-wrenching moral dilemma and a punch-the-air moment of cathartic satisfaction. At this point Animorphs has been treading water for a while. Not anymore. Maybe the most important book since the very first.
46. The Deception – Recommended
The Animorphs attempt to stop the Yeerks from engineering a third world war. What happens in this book isn’t entirely essential to the plot going forward, but it does represent a massive escalation of the stakes and conflict and really creates the sense that a Rubicon has been crossed and there is no going back. Plus it’s a great book for Ax in terms of examining his loyalties and unique position as an alien among humans.
47. The Resistance – Skippable
The Yeerks discover the location of the free Hork Bajir, leading to a battle to protect their valley. Look, technically this book advances the plot, but it also pretty much sucks. Alternating chapters set in the Civil War are supposed to parallel the modern situation but are just annoying and even the present-day stuff is undercut by a lot of dumb decisions made by seemingly smart characters. In the end even if it does slightly move the pieces, nothing happens in this book that isn’t efficiently recapped later so you can easily skip it.
47.7. The Ellimist Chronicles – Recommended
The Ellimist details his backstory to a dying Animorph. This is Animorphs at its most sci-fi, so your mileage may vary on how enjoyable you find it. It’s an engaging, clever and powerful read that gives a genuinely satisfying backstory to a character who might have been better off left a mystery, but reading it in release order is kind of frustrating as it feels like it kills the momentum and unlike the other Chronicles books there isn’t much in it that has any bearing on the mainline series. But it’s still a good book and enriches the mythology in surprising and memorable ways.
48. The Return – Essential
David returns and attempts to take revenge against Rachel – with help. Okay so look, this book is a bit of a struggle at first. The plotting is wild and the use of dreams within dreams within dreams more annoying than anything. But it really examines Rachel’s role within the group and the internal struggle that has always characterised her. And the ending, which would seem like an unnecessary coda to the David Trilogy if it wasn’t so goddamn powerful, is one of the most haunting moments in all of Animorphs.
49. The Diversion – Essential
When the Yeerks finally figure out their enemies are human, the Animorphs must race to evacuate their families. Everything just got very, very real. The game changes and then some as one by one the team try to rescue their loved ones – in some cases successfully, in others, not so much. This book is suffused with a sense of apocalyptic finality, a last desperate attempt to do some good before all hell is unleashed. And at the centre of it all is Tobias’ reunion with his long-lost mother, a returning character from The Andalite Chronicles. The first quarter of this book is your basic Animorphs. After that it’s a breathless, heart racing, moving, edge of your seat race that changes everything forever.
50. The Ultimate – Essential
As their situation grows more desperate, the Animorphs are forced to begin recruiting. At this point in the series the game changers are coming thick and fast, and with them an overall shift in tone. There’s a consistent darkness and maturity running through these final books, a sense of discomfort at seeing these characters and their relationships begin to crack under the weight of what they’re dealing with, in some cases becoming almost unrecognisable. This book is packed with surprising turns and moral dilemmas, and ends on a seriously controversial choice by one of the characters – an important one, but one that might just have you throwing the book against the wall.
51. The Absolute – Essential
When the Yeerks begin a plan to take over the National Guard, the Animorphs finally decide to alert the authorities to what is going on. Compared to the surrounding books this feels almost light, but it continues the sense of impending finality that’s been growing over the last few books. There’s a lot of fun to be had, laugh out loud lines, great action and charming character moments and considering how heavy everything’s getting, the almost-respite is quite welcome. Even if, by the last moments of this book, it’s clear that any chances for fun are now gone.
52. The Sacrifice – Essential
The Animorphs must decide whether to take a chance to blow up the Yeerk pool – killing thousands of innocents in the process. And so we careen towards the series’ climax with another massive game changer rife with terrible choices and impossible-to-comprehend consequences. There’s some repetition here in terms of Ax’s character development, but definitive resolution as well as a grim table setter for what is about to come.
53. The Answer – Essential
In the midst of open war Jake sets his final plan in motion. Oh boy. The climax of the series is an absolute barnstormer. Dark, emotional, wrenching and saturated with a growing sense of dread as you begin to understand what victory here will cost in terms of our heroes’ lives and souls. In these final books Animorphs feels different – there’s not much humour and any pretence of being what would traditionally be considered ‘kid friendly’ is out the window. The choices made here will stick with you no matter your age.
54. The Beginning – Essential
The war ends and the survivors deal with the aftermath. And so after all the insanity, darkness and at times, frankly, bullshit, Animorphs makes its final case for what it always was at its core; a story about the cost, necessity and folly of war. An interrogation of what is justified and what isn’t without any easy answers. An examination of the different but always profound ways that war affects the survivors. A series that sits with discomfort in its final moments before pivoting to a cliff-hanger that on release frustrated millions but now looks kind of bold, if still a little maddening in its lack of resolution. But really, Animorphs wraps up its core story in powerful, satisfying, thought provoking style while leaving us with the beginning – and maybe end – of a whole new one that to date exists only in our imaginations. It’s a great ending to a great if uneven series, that remains kind of astounding in ever being allowed to exist at all.
Writing words about writing words.