Animorphs is about a group of kids given the chance to fight evil, before it is to late. They are given the chance to transform into animals and use these animal forms to fight evil aliens, but they keep this war secret, because if their names are found out, Earth is doomed! These alien can take control of you, and you have no idea who is who? so will you join the fight? or join with the aliens called Yeerks?
I have most of the book series, do not somehow watch the tv show, only do that when you have read the books. but watch it if you want. If you wanna start reading these books begin with "The Hork-Bajir Chronicles" and then read "The Andalite Chronicles" After reading that, you should read "Animorphs: The Invasion" and so on. I find it a great read.