Applegate, Katherine

This story is about Ellimist, a being with the ability to alter space and time.

The Animorphs try to thwart the Yeerk plan to invade Earth by destroying the ability of people to make decisions.

The Animorphs try to thwart Visser Three's plan to recover advanced technology from the ocean which he could use to conquer the earth.

An explosion from a downed submarine blows the Animorphs millions of years back in time.

The Animorphs help their Chee allies by entering the depths of the ocean.

No one knows who they are.

Marco is a reluctant Animorph, having been given the ability, along with four other friends, to change into animal forms by an Andalite prince, an alien who wants help in stopping an invasion of the enemy Yeerks, but when he discovers that his mom, who he believed was dead, has been taken over by the Yeerks, he finds a reason to fight.

The Animorphs are in real trouble when they transform into flies to invade the new base of the alien Yeerks, and Jake becomes the enemy after falling into the Yeerk regeneration pool.