Megamorphs Series by K.A. Applegate, Katherine Applegate

We never should have done it. But we needed a break. You know, some time off from the superhero stuff. A chance to act like normal kids. Well—as normal as four kids who can morph, a hawk, and an alien can be. Everything should have been cool.Now Rachel is missing. And there's this . . . this thing that's after us. But it's not up to me to tell the whole story. Tobias, Cassie, Marco, and Ax were there, too. Even Rachel has some info to add. So go ahead and check this out... moreWe never should have done it. But we needed a break. You know, some time off from the superhero stuff. A chance to act like normal kids. Well—as normal as four kids who can morph, a hawk, and an alien can be. Everything should have been cool.Now Rachel is missing. And there's this . . . this thing that's after us. But it's not up to me to tell the whole story. Tobias, Cassie, Marco, and Ax were there, too. Even Rachel has some info to add. So go ahead and check this out. And remember not to tell anyone what we're about to tell you. It could mean the difference between life and death. Or worse. . . . less

We could blame everything that happened on Marco. He was the one who heard about the downed submarine. He was the one who thought we should check it out. And everyone knows that if Marco's up to a challenge, I'm definitely there.Everything was going fine. Until the explosion. An explosion that blows us millions of years back in time. Back to the age of dinosaurs. Now Tobias, Cassie, Marco, Ax, Jake and I are fighting for our lives with every step we take. But that's not our biggest problem... moreWe could blame everything that happened on Marco. He was the one who heard about the downed submarine. He was the one who thought we should check it out. And everyone knows that if Marco's up to a challenge, I'm definitely there.Everything was going fine. Until the explosion. An explosion that blows us millions of years back in time. Back to the age of dinosaurs. Now Tobias, Cassie, Marco, Ax, Jake and I are fighting for our lives with every step we take. But that's not our biggest problem. Our biggest problem is we have no idea how to get back to our own time. . . . less

We found out who Visser Four is. And he has found the Time Matrix. The machine Elfangor had hidden in the abandoned construction site. The same place we met him on a night none of us will ever forget. Especially me. Now Visser Four has the Matrix, and he plans to use it to become Visser One.But Jake, Rachel, Cassie, Marco, Ax and I can't let that happen. We can't let him alter time so that the Yeerks will win this invasion. So we're prepared to make the ultimate sacrifice... moreWe found out who Visser Four is. And he has found the Time Matrix. The machine Elfangor had hidden in the abandoned construction site. The same place we met him on a night none of us will ever forget. Especially me. Now Visser Four has the Matrix, and he plans to use it to become Visser One.But Jake, Rachel, Cassie, Marco, Ax and I can't let that happen. We can't let him alter time so that the Yeerks will win this invasion. So we're prepared to make the ultimate sacrifice. And, ultimately one of us will lose this fight. . . . less

What would you do if you had the opportunity to change your life? Not just where you live or who you hang out with, but your past, present, and future? Sounds like it might be pretty cool, right? Well, that's what Jake thought. He thought it might be easier if the Animorphs had never existed. If they'd never met Elfangor. If they all had the chance to be "normal" kids.Jake gets his wish.But things aren't quite as simple as they seem... moreWhat would you do if you had the opportunity to change your life? Not just where you live or who you hang out with, but your past, present, and future? Sounds like it might be pretty cool, right? Well, that's what Jake thought. He thought it might be easier if the Animorphs had never existed. If they'd never met Elfangor. If they all had the chance to be "normal" kids.Jake gets his wish.But things aren't quite as simple as they seem. Just because the Animorphs no longer exist doesn't mean the Yeerks no longer exist. Except now Jake, Rachel, Tobias, Cassie, and Marco can't morph. They don't even know the Yeerks are out there. And it's not such a wonderful life. . . . less