The Underground (Animorphs)

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Animorphs 17: The Underground

Rachel morphs into a bat.
Author K.A. Applegate
Cover quote There's nothing to fear but the Yeerks themselves...
Illustrator David B. Mattingly
Narrator Rachel
Pages 164
Release date 1998
Previous Book The Warning
Next Book The Decision

The Underground is a science fiction novel by K.A. Applegate in the Animorphs series.

  • New Morphs: All - Mole, Tobias - Bat

The animorphs see a man jump out of an office building and save him. Then Rachel finds out he has been talking about Yeerks, so the Animorphs go to talk to him. He tells them that he is a controller, and the Yeerk inside him who doesn't need Kandrona Rays because he ate Maple and Ginger Instant Oatmeal, which seems to give Yeerks to ability to survive without Kandrona Rays. However, there is a downside. The Oatmeal is extremely addictive and makes the Yeerks who eat it go crazy and are only able to control their host some of the time. The animorphs decided to dump a bunch of oatmeal into the Yeerk pool, which would cause thousands of Yeerks to go insane.

Unable to enter the Yeerk Pool the normal way because of a new invention called the "Gleet Bio-Filter", which doesn't allow creatures besides Humans and Yeerks to enter the Yeerk Pool, they spend a week digging through the ground as moles. Upon entering the Yeerk Pool, they are attacked by two hunter robots and Rachel falls into the yeerk pool. She morphs an ant, gets out, steals a dracon beam and disguises herself as a human controller. She learns that Ax and Tobias have been captured and there is a large amount of Maple and Ginger Instant Oatmeal near the yeerk pool.

When Visser 3 comes, she throws the oatmeal into the pool and gives the dracon beam to Marco who is a gorrila and has hands. Visser 3 decides to sacrifice the Yeerks in the pool in order to catch them, so Rachel throws him in too. Visser 3 starts to morph giving them no chance to escape, so Marco shoots open the barrels of Oatmeal in the pool. Then he collapses the tunnel and the animorphs escape as moles.