The Animorphs Series - free ebooks

In the Animorphs series, Earth is being invaded by an alien species called Yeerks. In their natural state they are helpless gray slugs, but they have the ability to take total control of any organism by crawling into its brain. They have already enslaved many species and humanity is next. Someone who has been enslaved by a Yeerk will act, look, walk, talk, and feel normal, but in a little corner of his mind he will be crying, screaming for mercy, but completely unable to move even one muscle. 5 kids have been given the power to morph, to temporarily turn into any animal they have touched, and are the only thing that stands between humanity and total enslavement.

The books can be downloaded here: