Started reading Animorphs 'cause I wanted to see if it was stupid. Boy was I ever wrong. Kids are fighting against mind-stealing aliens in this incredibly spooky and realistic-sounding character-oriented saga. In the first book they figure out what the circumstances of the invasion are and are given their morphing powers. I read the entire series. It is probably a lot different from what you think. I read these for the first time when I was in my mid-twenties, so that should tell you something. . . .
Lots of people think Animorphs is stupid based on their (wrong) assumptions about the books or because they have seen the less-than-stellar television show. But the series is amazing. You can laugh, now shut up and get the first one. Basic premise: Five kids get the ability to morph into any animal they can touch (to acquire their DNA). A dying alien (an Andalite) gave them the power because there are other aliens, slug-like creatures called Yeerks, trying to take over the planet by squirming into people's ears and taking over their bodies. So it's a quiet invasion, people are being taken one by one and then made to act as though everything is cool . . . and of course, they become recruiters for getting more people to infest.
The Animorphs--Jake, Rachel, Cassie, Marco, and Tobias (and later, an Andalite kid named Aximili, Ax for short)--are all that stands between the rest of the world and total slavery; they're trying to hold off the Yeerks until the backup Andalite fleet gets there. They use their morphing technology to spy on the Yeerks and to destroy their facilities and whatnot.
But what makes these books so amazing is that these are kids, having to pretend they're normal kids so no one knows they're the "Andalite bandits," and they are fighting the enemy while living right out in the open, under their noses. Internal Andalite and Yeerk politics make the situations complicated, and through the fifty-four (and then some) book series it slowly escalates to an all-out war, with a child (Jake, leader of the Animorphs) as basically the president and general of the forces of Earth.
Thousands of humans and aliens die, sometimes in violent and horrible ways, and stunning moral crises present themselves all through the series. The Animorphs form alliances with other species and with each other; they have the beginnings of romantic relationships in some cases; they still have homework and family problems (in some cases, serious ones). These six kids put their personal problems aside as best they can and become warriors, completely losing their innocence and most of their humanity in the process. Though they're considered kids' books and the TV show was a bit goofy, I have no doubt that if marketing had been different and the thin serialized books had combined into fourteen or fifteen thicker books, it probably could have been accepted by adults. But since it's an intermediate series, you probably think I'm kidding around about how good these are. But I'm serious. Ms. Applegate's books are not without flaws (there are occasional continuity errors and little speed bumps), but they are highly recommended.
Here are some of the inconsistencies and notable aspects of the book:
Jake opens the book by claiming he can't reveal his name or identifying personal information because it would help the Yeerks find him and his friends and family. The problem is, they keep up this "we can't tell you who we are" schtick throughout the series until open war is declared late in the game, and despite that even from the beginning there are multiple details that could have easily identified them. This breaking-the-fourth-wall bit is poorly conceived, because it also reveals that the Animorphs are human, and that's a detail they try to keep secret from the Yeerks (and succeed at keeping for over half the series). Just finding any five kids with their names and descriptions at a school in a known area (near The Gardens) would be a pretty easy afternoon's work for a Controller with data processing experience, but since they give even more information (siblings' and parents' names, specific recognitions the kids have gotten, etc.), it would have been cake to track the kids down if these books were actually released into the same world they're trying to hide in.
Marco is shown to have always had the capacity to be a master strategist, an ability that comes out obviously much later in the series. Before they even become the Animorphs, Marco uses his strategy abilities to beat Jake in video games.
It is shown even in this first book that Cassie and Jake "like" each other. Cassie asks the boys to walk with them when they cut through the construction site; if she hadn't just wanted to have a chance to be near Jake, they might not have all been together to meet the alien. It is a bold step in a children's series to have interracial dating (Cassie is black, Jake is white); not many authors have tried to cover that sort of ground in children's literature, but in these books it totally is beside the point.
Jake only knows Tobias because he saved him from bullies once. Now Tobias sort of looks up to him, which is what got him involved in the first place. Little did he know he would pay his hero back by acting as a loyal soldier to Jake in the most bizarre war ever to hit Earth.
The Andalite, Elfangor, is said to have a three-dimensional picture of "his family" inside the ship, and there were two that were children. Since Elfangor was an adult when Ax was born, it's unlikely that one of the children was himself, so this is suggesting that Elfangor was the father in the picture and that he had a wife and two children. But in later books there were never any references to Elfangor taking an Andalite mate or having kids. This, like several other issues that crop up in this book, is probably just a result of the author not having worked out all the details yet when she wrote the first book.
The kids find out early on that morphing fixes injuries, so it's confusing how Elfangor, who had the morphing power, could have been mortally wounded and not morph to get rid of it. It's possible he was too exhausted, but he was in much better shape than the kids later were sometimes when they morphed to escape mortal injury, and he had enough time and energy to give instructions and information about the Yeerk invasion, so he probably should have been able to morph and fix his injury. He still would have had to deal with Visser Three, but the fight would have been very different. It is also possible he was tired of fighting and had made peace with his death, but that seems a bit unlikely . . . unless he was deliberately doing it to provide a distraction for the Animorphs' escape.
A lot is revealed to us through the communication between Elfangor and Visser Three, right before Elfangor is destroyed. In the conversation, it is revealed that the Hork-Bajir are slaves, conquered and stolen by the Yeerks, but that the Taxxons, the giant worms, are actually allies, voluntary hosts. Also, we learn that a "visser" is a rank in the Yeerk society, and that Visser Three aspires to be Visser One. And finally, we find out why the Yeerks want humans: Because they are easy to conquer and very numerous, yet are pleasant bodies to live in.
The fight between Visser Three and Elfangor (well, the scene in which the visser eats him) doesn't suggest that they have a very long history. They're clearly rivals, but it's a stale conversation that shows none of the very personal nature of this battle--information readers discover later in the series.
When the kids meet the Andalite, Tobias is the most drawn to him, and seems the most sympathetic to his situation. There's a reason for this, which is revealed much later in the series.
Jake is appointed the leader very early on, when the other kids are first looking to him to see if they would accept the power to morph. This puzzles him at first, but he is indeed the best leader, and later in the series he embraces his position.
This book contains an inconsistency. In this book in several instances, humans were able to project their thoughts, once to the Andalite and also Jake was able to send his thoughts to Tobias while Tobias was morphed but Jake was not. This is not how the thought-communication works in later books; normally they can only direct their thoughts while in a morphed form, and at that point they can direct thoughts to one person or many however they like. But no one can just hear them thinking when they are human (as Prince Elfangor does at the beginning of this book). Ms. Applegate was asked about it in an interview, and she replied that she could make up some kind of lame excuse if she wanted, but in all honesty she'd just made a mistake and hadn't worked that out fully before incorporating it. It's been said that this is fixed in the reprint.
Tobias is the first to morph. He turns into his pet cat. It is through that experience that they realize that morphing isn't at all painful, and that they also receive the instincts of the animals they morph into, since Tobias knows who he is while in cat morph but still somehow wants to chase strings and kill mice. Morphing also has the unfortunate side effect of making them turn up naked after they've shrunk out of their clothes, though later they do learn to morph skintight clothing as part of their human forms.
Tobias and Jake discover through their first morphing experiences that acquiring an animal's DNA puts the animal into a trance.
Another inconsistency was in this book: When Jake turned into his dog, it was more like he was an exact copy of Homer than the same dog from the same DNA. He seemed to have Homer's memories (e.g., he knew a bunch of information, through scent, about another male dog that Homer knew). Also, he was apparently neutered just like his dog, and in a later book the kids acquire DNA from steer and end up morphing into uncastrated bulls, which makes them quite a bit more violent. Apparently the physical details of an animal that are not genetic were still able to be copied at this stage of the game but not later. (This brings up a plethora of questions, such as how copying from DNA can possibly dictate how old they are when they morph, or things like hair growth or weight or distinctive markings acquired through life choices and whatnot.)
While in dog form, Jake can apparently smell something he relates to Visser Three when he gets the scent of his brother, Tom. This is because, unbeknownst to him at the time, Tom is a Controller. It seems odd that they don't use the dog's ability to smell Yeerks as a way to detect Controllers in later books.
Cassie is revealed to be the best morpher; she is the first to learn to morph clothing and can morph with both more speed and more control than the others.
When Tobias acquires a hawk morph from an injured hawk in Cassie's barn (a.k.a. the Wildlife Rehab Clinic), it is discovered that injuries to the acquired animal do not affect the DNA itself, so they can morph into an uninjured animal.
The "full members" of The Sharing (a.k.a., people infested with Yeerks) have one of their meetings on an open beach where anyone can just wander up. This lack of security is amazing considering the precautions they're forced to take in later books; it's funny to read this and see Controllers just talking about their plans out in the open.
Rachel is also revealed to kind of like Tobias, even this early on. She mentions that she cares about him, and occasionally says and does things to comfort him that she doesn't do for anyone else.