Animorphs Megamorphs #01: The Andalite's Gift (The first book in the Animorphs, Megamorphs series)

Wishing they could take a few days off from fighting the alien Yeerks, the Animorphs face another difficult challenge when Rachel loses her memory in an accident and the rest of the companions are trapped by a destructive dust cloud. Original." 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. Wellas 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. . . . His name is Elfangor-Sirinial-Shamtul. An Andalite war-prince. The one who gave five young humans the ability to morph into any animal they touch. They are still out there, fighting an evil so powerful there isn't a moment that goes by when they can actually feel safe. Their story continues. But *this* is how it all began. The Animorphs needed a break from the superhero stuff and everything should have been cool. But Rachel is missing and something is after the kids.