In other words, they can change into any animal they touch by absorbing a strand of the animal’s DNA. They are then able to create an exact copy of the animal and take on its form. This ability allows them to change into any animal they touch. The book is part of a series. In this particular book, the characters find an entrance to a Yeerk pool, which is a necessity for their alien enemies, the Yeerks. Once inside, they creep around as roaches to gather information about the location of the Yeerks’ Kandrona, a portable version of the Yeerks’ home sun that they plan to destroy. However, they don’t anticipate becoming a Taxxon delicacy.
The Taxxons are allies of the Yeerks. The Animorphs, consisting of Jake, Rachel, Marco, Cassie, and their alien friend Ax, were about to be devoured when time itself stopped, except for the Animorphs. They then meet an Ellimist, a creature who is woven into time and space itself, who stopped time to ask the Animorphs to decide the fate of the human race. The Animorphs can either leave Earth to the Yeerks and go to another planet or stay and fight. When they decide to stay, the Ellimist puts them back on the Taxxon’s tongue. They manage to get out of the Yeerk pool in one piece.
A couple of days later, they meet in the woods around Cassie’s house and have a conversation about reconsidering the Ellimist’s offer. Suddenly, they are zapped into a possible future. There, they walk and look around freely since everyone is a Controller, a creature controlled by a Yeerk. Yeerks are parasites that infest a creature’s brain and take over its body. The creature is still there, but it can do nothing. While the Animorphs are walking around, they come upon a HUGE Yeerk pool, more like a lake. You could have ridden a boat around it, and you wouldn’t look out of place. A Bug Fighter then lands near the Yeerk pool. A Bug Fighter is the smallest kind of spaceship the Yeerks have. Rachel, an Animorph, feels drawn to the Bug Fighter, so she and Ax walk over to it. Since everyone thinks Ax is Visser One, the most powerful Yeerk, everyone stays out of their way. Then the real Visser One steps out, along with another Rachel who is a Controller.
After Rachel knocks Visser One down as a bear, they are transported back to the present by the Ellimist. That night, Rachel has a dream and figures out where the Kandrona is. After gathering everyone, they go to the EGS Tower. Next, they morph into their dangerous animals, break in, and go to the top floor. There, they enter a room where eight Hork Bajir Controllers are guarding the Kandrona. Hork Bajir are aliens taken over by the Yeerks. After a huge battle, The Animorphs enter another room where the Kandrona is. Then, they go home with a victory.