Animorphs

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.

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

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.

On trial for treason, Edriss 562 explains how she infested a series of human hosts in order to spearhead the invasion of Earth by her people, the ruthless, parasitic Yeerks.

Marco, one of a group of young people who have been given the power to change into an animal in order to fight an invasion by the alien Yeerks, decides to check things out when his old friend Erek begins behaving oddly.