The Visitor: the Graphic Novel (Animorphs #2)

Rachel is still reeling from the news that Earth is secretly under attack by parasitic aliens, the Yeerks. Now she and her friends are the planet's only defence—five kids who, purely by chance, stumbled onto a downed spacecraft and were given the power to morph into any animals they touch. Rachel's fearless. But what she finds inside may be more than even she can handle.