Originally Posted by
Jackalope89
They're a group of teens that gained the ability to turn into any animal they have touched (animal morphers, hence, Animorphs), but gained those abilities to battle an alien invasion of parasitic slugs that take control of a person's mind by crawling into their ear. They can read memories, mimic behaviors, and be the perfect actors. But every three days, they need to leave their host to absorb special rays to stay alive. Whereas the Animorphs can only retain their animal form for 2 human hours. But, short of instant death injury, should they be able to morph back to human, any and all injuries they got were fully healed. Among them, the resident alien, Ax (for short), resembles a blue centaur, with no mouth, too many fingers, and a scorpion like tail with a nasty blade on it. When said tail is used, its too fast for the human eye, and can easily decapitate a human (and other such creatures).
Thanks to the Animorphs' experience in many battles, including dealing with nasty alien beams, and horrific alien forms their main foe Visser Three acquired (think along, a General's rank or so, but a mind-controlled and older version of Ax), they've been fairly successful in their endeavor overall. Plus, they each have multiple animal forms to choose from. Like Rachel likes swapping between the African Bush Elephant and the Grizzley Bear as her main battle morphs.
...I'm surprised I remembered that much. And that's STILL only a tiny bit of the series overall plot.