Marco's mom is back. But she's not Visser One anymore. Marco's not even sure if she's still a Controller, but he's determined to find out. No matter what it takes. No matter what might happen. Marco wants his mom back. Jake and the other Animorphs realize that Marco is under some serious stress. And that the situation with his mom could very well jeopardize everything they've worked for. Now they also have to wonder if Marco will be the one to give...

Cassie and the other Animorphs have a few little problems. A few very little problems. Actually, the problems call themselves Helmacrons. They're less than an inch tall, and they're pretty upset at Cassie. They believe she stole their ship. Cassie thought it was just a toy and gave it to charity. Now the Helmacrons want it back. So the Animorphs have a new dilemma. Because the Helmacrons have their own secret weapon: They can shrink other beings...

"Horace and Hattie watch a caterpillar become a butterfly ... and are inspired to attempt a transformation of their own!"--

The Specialist helps Alex defeat the Spellbinder after he uses a book to turn his friend, Mattie, into a rat.

A young boy, Paolo, and the man who murdered his parents, Angel, gradually become like father and son as they live and work together on the remote Chilean farm where Paolo was born.

Visser Four has found the Time Matrix, the machine Elfangor had hidden, and he plans to use it to become Visser One.

Cody the caterpillar is unhappy being stuck on the ground, but with encouragement from Beulah Lee Bird and Franny McFly he follows God's plan for him and strives to reach a place called Far Flutterby.

Katie and Suzanne want to see the new big movie, Tornado, but neither of their parents will let them. As Suzanne complains loudly about always being treated like her baby sister, Katie actually becomes Suzanne's baby sister, Heather. When Katie is Heather-she speaks. Find out how Katie gets out of this one! Annotation. Katie's wish comes true when she starts turning into other people. When Suzanne complains loudly about being treated like her baby...

When cold weather arrives, five friends (a grub, a beetle, two worms and a caterpillar) prepare for the winter. They amuse themselves in conversation and by playing games. But a little caterpillar only wants to sleep and dream.

Jake has to attend a wedding out of town. No one has been designated to take over as leader of the Animorphs. But when Tobias tells the others that he's found the place where Visser Three currently feeds, there is a unanimous agreement on going after him. The kids aquire cheetah morphs to run the visser down. Unfortunately, there's a new player on the scene: an inspector sent by the Council of Thirteen to check on Visser Three's eternal problems....