Animorphs - The Android

About “Animorphs - The Android”

Marco runs into his old friend Erek but doesn't think much of it. He is focused on more important tasks, like helping to save the world. However, he learns that Erek has been spending time with kids from The Sharing. This makes Marco suspect something strange is happening. Marco, Jake, and Ax decide to morph and investigate Erek to see if he has been infested by a Yeerk. They find out Erek is not a human-Controller, but he is not human at all. This is a 1997 novel by Katherine Applegate.