Animorphs is a science fantasy series of children's books written by Katherine Applegate and her husband Michael Grant, writing together under the name K. A. Applegate, and published by Scholastic.It is told in first person, with all six main characters taking turns narrating the books through their own perspectives. Horror, war, dehumanization, sanity, morality, innocence, leadership, freedom, family, and growing up are the core themes of the series.
The story revolves around five humans: Jake, Marco, Cassie, Rachel and Tobias, and one alien, Aximili-Esgarrouth-Isthill (nicknamed Ax), who obtain the ability to transform into any animal they touch. Naming themselves "Animorphs" (a portmanteau of "animal morphers"), they use their ability to battle a secret alien infiltration of Earth by a parasitic race of aliens resembling large slugs called Yeerks, that can take any living creatures as a host by entering and merging with their brain through the ear canal. The Animorphs fight as a guerilla force against the Yeerks who are led by Visser Three.
The series was adapted into a Nickelodeon television series in 1998 and Graphic Novel adaptation in 2020.
