Note! This book takes place before book #23, The Pretender, although the events told in the story occur between the time of The Ellimist Chronicles and The Andalite Chronicles.
Before the Animorphs... on another world... the fight began. Prior to their invasion of Earth, the Yeerks attacked a gentle and docile species known as the Hork-Bajir. This is the story of a special Hork-Bajir, his Andalite friend, and their future enemy, Visser Three.