The Weakness is the thirty-seventh book in the Animorphs series, written by K.A. Applegate. It is known to have been ghostwritten by Elise Smith. It is narrated by Rachel.

Official DescriptionEdit

When Jake has to leave town for a family thing, the other Animorphs and Ax figure life will pretty much be normal until he gets back. But when Tobias discovers Visser Three's newest feeding place, the kids decide they have to check it out.

But there's no assigned leader. Now Rachel, Tobias, Cassie, Marco, and Ax have another problem: Who will be the best one for the job? Because being in charge isn't just guts and glory. It's about making decisions that will mean the difference between life...and death.

Plot SummaryEdit

The Weakness Illustration

The first-page illustration from The Weakness, showing Rachel, Marco, Cassie, and Ax in their cheetah morphs and Tobias up in the sky getting ready to deal with Visser Three.

Jake goes on vacation, Rachel becomes leader of the Animorphs (much to Marco's distaste). During a failed attempt to kill Visser Three using cheetah morphs, they learn that he is being inspected by the Controller of a Garatron, a superhumanly-fast alien that physically resembles an Andalite. So they attempt to discredit Visser Three in front of the Inspector, who represents the Council of Thirteen, by attacking various known-Controller-operated or-owned businesses.

The first attack is at a news station, where they go in without any recon, as suggested by Marco. Rachel notices a tour group passing by during their attack and learns later with Cassie, by watching a store's television, that an old man with a heart condition dies of a cardiac arrest during the attack on the station.

Her recklessness, however, almost kills Cassie when she is captured in morph by the Yeerks. But, with some encouragement from Marco, Rachel leads a rescue mission where Marco, in cobra morph, poisons the Inspector, who attacks after some careful prodding by Visser Three. With its enhanced metabolism, the effects of the poison rapidly take its toll on the Garatron, and he dies. Afterward, Rachel talks to Jake, who returns home from his vacation.


Morpher Morphs acquired Morphs used
Jake -- --
Rachel Cheetah Bald Eagle, Cheetah, Grizzly Bear, Polar Bear
Cassie Cheetah Osprey, Cheetah, Wolf, Polar Bear
Marco Cheetah Osprey, Cheetah, Silverback Gorilla, Polar Bear, Cobra
Tobias -- Polar Bear
Ax Cheetah Northern Harrier, Cheetah, Human (Main), Polar Bear
Visser Three -- Unnamed Muck Monster


  • This book was sold in a clear cellophane wrapper, also containing a small plastic keychain featuring the often-used 'A' logo.
    Book 37 zipper pull tag

    Zipper tag shrink wrapped with Book 37

  • According to the Anibase, K. A. Applegate used this book to stress the differences in individual strengths and weaknesses of the Animorphs, using Rachel's lack of leadership abilities (despite her heroic warrior abilities) as an example.
  • The front cover quote is, "Jake's not around. Who will take his place?" This was the second cover quote to end with a question mark.
  • The inside front cover quote is, "The time has come....".


International coversEdit


  • Cassie says she has a niece who likes Blue's Clues, but that's not true. Cassie is an only child. (Citation needed.)

Taken from

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Main Series #1 The Invasion | #2 The Visitor | #3 The Encounter | #4 The Message | #5 The Predator | #6 The Capture | #7 The Stranger | #8 The Alien | #9 The Secret | #10 The Android | #11 The Forgotten | #12 The Reaction | #13 The Change | #14 The Unknown | #15 The Escape | #16 The Warning | #17 The Underground | #18 The Decision | #19 The Departure | #20 The Discovery | #21 The Threat | #22 The Solution | #23 The Pretender | #24 The Suspicion | #25 The Extreme | #26 The Attack | #27 The Exposed | #28 The Experiment | #29 The Sickness | #30 The Reunion | #31 The Conspiracy | #32 The Separation | #33 The Illusion | #34 The Prophecy | #35 The Proposal | #36 The Mutation | #37 The Weakness | #38 The Arrival | #39 The Hidden | #40 The Other | #41 The Familiar | #42 The Journey | #43 The Test | #44 The Unexpected | #45 The Revelation | #46 The Deception | #47 The Resistance | #48 The Return | #49 The Diversion | #50 The Ultimate | #51 The Absolute | #52 The Sacrifice | #53 The Answer | #54 The Beginning
Megamorphs The Andalite's Gift | In the Time of Dinosaurs | Elfangor's Secret | Back to Before
Chronicles The Andalite Chronicles | The Hork-Bajir Chronicles | VISSER | The Ellimist Chronicles
Alternamorphs The First Journey | The Next Passage
TV Tie-Ins Meet the Stars of Animorphs