They have come to destroy you.
I couldn't believe what I heard but, at the same time, I knew he wasn't lying. Apparently, everyone else felt the same way because no one disagreed with him. Maybe it was because he was dying, and we knew he was trying to warn us of something terrible.
They are called Yeerks. They are different from us. Different from you, as well.
"Are you telling us they're already here on Earth?" Rachel demanded.
Many are here. Hundreds. Maybe more.
"Why hasn't anybody noticed them?" Marco said reasonably. "I think someone would have mentioned it at school."
"Maybe it's because they're shape shifters, or they have cloaking technology," I said, all sorts of ideas running through my head. "Or maybe it's plant life that kills the original human while replacing him or her with a double. Like Invasion of the Body Snatchers."
"You watch too many movies," Marco remarked.