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Almost nothing could be as bad as finding out your mother is Visser One, the most powerful leader of the Yeerk invasion of Earth. But it happened to Marco. And even though he's been handling it pretty well, he knew there'd come a time when he'd have to face her again, knowing that the Yeerk in her brain has taken his mother away. So when Marco and the other Animorphs discover that Visser One is overseeing a secret underwater project, they know they have to check it out. But Marco's not sure if this is a battle he'll be able to fight.

Tobias has gotten used to his new life. He's a red-tailed hawk with the mind of a kid. It was difficult when he first became trapped in his morph, but he's started to come to terms with things. After all, how many kids actually get the chance to fly? But now Tobias is about to make a very difficult choice: a choice that the other Animorphs know nothing about. And it could mean the difference between living the rest of his life as a hawk...and being human.

Rachel's got some pretty strange stuff happening. She can't control her morphing. One minute, she's doing homework. The next, she's morphing a full-grown crocodile, and - without returning to human form - she becomes an elephant. That's when the floor gives way and Rachel finds herself looking up at what used to be the kitchen ceiling. What's going on? No one's sure, but Rachel and the other Animorphs have to figure it out - quickly. Because if someone sees Rachel's out-of-control morphing, the other Animorphs are in for some serious trouble.

There's been an accident. Someone crash landed a Yeerk Bug fighter, and the Yeerks have been trying to cover it up - quickly. When Tobias spots it before they get the chance, the Animorphs decide to steal the ship, to show the world that Earth has been invaded. That's when things go terribly wrong. Before they know it, Jake and the other Animorphs find themselves in another place. Another time. And there's no way home....

When Marco runs into his old friend Erek, he doesn't think too much of it. He's got more important things to do, like helping to save the world. But then Marco finds out Erek's been hanging with some of the kids at the Sharing, and he starts to think that something just a little weird is going on. So Marco, Jake, and Ax decide to morph and check old Erek out. Just to see if he's been infested with a Yeerk. The good news is that Erek's not a human-Controller. The bad news is that Erek's not even human.

Ax is an Andalite, an alien, stranded on a strange planet he's sworn to defend, even though it's not his own. Since the Animorphs rescued him, he's fought at their side, and in that time they've come to consider Ax a friend. But deep inside, Ax knows he isn't their friend. He can't ever be. Andalites must always hold themselves apart, even from their allies. As the Animorphs' past actions start resulting in deaths of innocent people, however, Ax's loyalty is called into question. Now he must decide whether to reveal the reason for his estrangement - the shameful secret of his people.

The last time Rachel and her friends entered the giant Yeerk pool beneath their town things went very bad. This time they plan to be careful, and sneak in as roaches, just to spy. Once they're inside, though, the team gets caught. But right as things are looking their most dire, everything stops. Everything. Then Rachel and the Animorphs hear a voice. It belongs to a very old, very powerful being, and it says it can save them. But if it does, the Earth will be defenseless.

Books seven and eight in Shannon Hale and Dean Hale's New York Times best-selling series take the Princess in Black on two of her biggest adventures yet!

Regan Fitz and Elliot Mason have been enemies since they started training to become Glitchers - people who travel through time to preserve important historical events. But everything changes when they find a letter from Regan’s future self, warning them about an impending disaster that threatens them and everyone they know.

On Al Chaudhury’s 12th birthday his beloved Grandpa Byron gives him a letter from Al’s late father. In it Al receives a mission: travel back to 1984 in a secret time machine and save his father’s life.

Meet Resilience, a Mars rover determined to live up to his name. Res was built to explore Mars. He was not built to have human emotions. But as he learns new things from the NASA scientists who assemble him, he begins to develop humanlike feelings. Maybe there’s a problem with his programming…. Human emotions or not, launch day comes, and Res blasts off to Mars, accompanied by a friendly drone helicopter named Fly. But Res quickly discovers that Mars is a dangerous place filled with dust storms and giant cliffs.

The magic tree house has returned, and it's taking Jack and Annie back in time to Alaska, 1925. There they meet Balto, a jet-black Siberian husky destined to save victims of the diphtheria epidemic. But the trail isn't easy, and Balto is going to need Jack and Annie's help!

When Stink learns that Pluto has flunked the Planet Test for being too shrimpy, he has no choice but to take a stand for the sake of little planets (and little people) everywhere. Will our humble hero, Stink Moody, be smart enough to defeat a panel of big-shot scientists and class know-it-all Riley Rottenberger? For the answer to this burning question, tune in - and prepare to have your universe rocked!

What's tasty, good for you, and only takes 60 seconds to make? Oatmeal. And because of a strange reaction to the Yeerk's physiology, it's making the would-be invaders of Earth more than a little crazy. Now Rachel and the other Animorphs have a new weapon against the Yeerks. Sounds good, right? Wrong. Because using this advantage against the Yeerks has dire consequences for their human hosts. In order to avoid hurting innocent people, the Animorphs will have to make another trip to the Yeerk pool, where they barely escaped with their lives.

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When Space Cadet Star Girl is sent to investigate with three other cadets, she knows they are in for a hairy ride. Can the cadets work together as a team to find the missing savanasaurs and stop the destruction of this planet?

An evil force has struck Planet Perilenda, and the skunettas are disappearing. When Space Captains Star Girl and Supernova 1 are sent to investigate, they soon learn that seeing isn't always believing. Can they see through the evil tricks in time to save the alien skunettas?

Planet Megamarsh is being destroyed by toxic waste, and the megamons are not happy. When SC Star Girl is sent to investigate with SC Red Giant, she finds out that it's not only deadly waste that can be toxic. Can she survive the toxic dumping long enough to save the planet and its alien megamons?

An underwater world is being poisoned, and the aquamantas are getting sick. Star Girl is eager to help, but she soon discovers that looks can be deceiving. Can the space cadets find the source of the poison and stop it in time to save the planet and its inhabitants?

An evil force has arrived on Planet Oceanella, and the seadons' wings are disappearing. When Space Agent Star Girl is sent to investigate with her two best buddies, they find that it's not only the seadons that must face this evil. Can the agents put a stop to the GDC mission and rescue the alien seadons before it's too late?