The Hidden (Animorphs #39) - K. A. Applegate

Andalites have finally arrived on Earth. The Animorphs and Ax now have allies willing to fight against the Yeerk invasion. But there are only four Andalites. Not nearly enough to defeat thousands of Yeerks. Not enough to stop more humans from being infested. Will Ax leave his friends in the Animorphs or stand with his people?

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Release date: 2000
Genres: science fiction, childrens
Updated: January 23, 2017