Books like The Sickness by Katherine Applegate
The Sickness follows the well‑known Animorphs as they confront an unexpected threat: a virus named yamphut that has infected the alien Ax. The story explores the Animorphs’ teamwork and their dedication to helping a friend in need. Set within the familiar universe of extraterrestrial beings and metaphoric metamorphosis, this plot‑your‑own adventure highlights the bonds that unite the characters while they face a new kind of danger.
First publish date: 1999
Genre: Science Fiction/Space Opera
Authors: Katherine Applegate
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Books similar to The Sickness (26 similar books)
When an alien arrives, Jake learns he can transform into any animal he touches, joining his friends Rachel, Cassie, Tobias and Marco to form the Animorphs—a group of children who fight extraterrestrial threats.
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When a young boy breaks a deadly time limit while morphing, he is locked forever as a hawk. To free himself, he must expose a Yeerk secret, battling an inner alien part that vies for control.
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When Earth faces a hidden alien invasion, Rachel and her friends discover they are the only ones who can defend the planet.
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When the Yeerks discover the hidden feeding ground of the Andalites, the Animorphs must stop a covert logging operation to protect their friends Ax and Tobias from the impending search of Visser Three.
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In this teenage science‑fiction adventure, the Animorphs confront the Yeerks by morphing into flies, while Jake’s transformation into the enemy forces the team to act quickly to protect their new base.
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A teenage team of Animorphs investigates an old friend whose strange behavior raises doubts about alien control.
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When a Yeerk Bug fighter crash‑lands, the Animorphs and their alien ally Ax hijack it to expose Earth’s invasion, only to be transported to another time and place with no way back.
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Tobias, after morphing into a hawk and losing his human form, is offered a chance to reclaim his powers and navigate a world of transformation and extraterrestrial allies.
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Cassie and the Animorphs confront the Yeerks as they try to protect a top‑secret base, Zone 91, where proof of alien life is hidden.
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In "The Experiment", the Yeerks attempt to develop a drug that removes human free will, but the Animorphs reveal that true freedom lies beyond any chemical influence, forcing a battle over the essence of autonomy.
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In The Weakness, the Animorphs confront a new threat when Tobias discovers Visser Three's latest feeding site.
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In this thrilling Animorphs adventure, Cassie and her friends discover that the tiny Helmacrons, upset over a stolen toy ship, threaten to shrink the planet unless their vessel is returned.
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Cassie becomes the host for a dead alien’s persona to aid the Hork-Bajir’s rebellion against the Yeerks, wading into a perilous alliance across cultures.
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An Animorphs adventure where the android Erek is in danger, and Rachel volunteers for a perilous deep‑sea mission with unknown consequences.
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Cassie, the only Animorph left alone, finds herself in the Australian Outback, isolated from her team as she must survive harsh terrain and connect with new allies while a looming threat, Visser Three, watches.
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The Animorphs face another peril as Tobias is captured by a Yeerk that claims to be part of a peace movement, threatening the team’s mission to protect Earth from alien infestation.
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Rachel faces a vengeful return to the desert island when David, the sixth Animorph, resurfaces after years of captivity and demand for revenge.
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Jake and his fellow Animorphs uncover a hidden underwater civilization while hunting Visser Three to protect the Pemalite ship.
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In this installment of the Animorphs series, Tobias and the team uncover that the Yeerks plan to test a device that could end their battle against the alien parasites.
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When the Yeerks invade the North Pole, the Animorphs must transform into animals to stop the alien conquerors from taking control of the world’s coldest frontier.
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A mysterious blue box sparks a race as David and the Animorphs hunt to claim it, pushing them toward dangerous transformations in a battle against alien threats.
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Cassie faces a difficult decision when she quits her role as an Animorph and must confront a relentless human-Controller who suspects her true identity.
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A tense clash between family ties and alien control unfolds as a powerful Yeerk battles to prevent a young boy’s brother from leaving home.
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A mysterious woman claiming to be Tobias’s long‑lost cousin arrives on his doorstep, sparking intrigue and hope as she shares surprising knowledge of his past.
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Join the Animorphs on their next mission in "The Next Passage"—a fast‑paced science‑fiction adventure where every decision could be the difference between victory and defeat.
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In the epic conclusion of the Animorphs series, Jake and his friends rally unexpected allies to counter a Yeerk onslaught and give Earth a chance to survive.
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