This wiki DOES NOT use SPOILER WARNINGS OR TAGS since the series concluded in 2001. If you are experiencing the series for the first time and do not wish to be spoiled, you are browsing at your own risk.



"If you don't let me contact the proper authorities, I'll—"
"What authorities, Mom? The police, the FBI, and the CIA have all been infiltrated by Yeerks."
Naomi and Rachel[src]

The Federal Bureau of Investigation (FBI) is the domestic intelligence and security service of the United States of America and the serves as the nation's principal federal law enforcement agency. During the war, multiple FBI agents were infested by the Yeerk Empire.


"I have four new voluntary hosts, Visser. Two are children recruited through The Sharing, the front organization. Of the two adults one is an agent for the FBI, a sort of policeman."
Iniss 226 to Esplin 9466[src]

In 1995,[1] the Yeerk Empire began its invasion of Earth. They landed in a city in California, from where they based their planetary invasion.[2] In 1997,[3] an agent for the FBI who lived in the city learned of the Yeerks and agreed to become a voluntary host, thereby allowing the Yeerk Empire to infiltrate the FBI.[4]



  1. In VISSER, Edriss 562 launches the invasion of Earth and fakes the death of her host, Eva. In #1, Eva is said to have died/disappeared two years prior. As #1 takes place in 1997, this places Eva's disappearance, and the beginning of the invasion of Earth, in 1995.
  2. The Beginning
  3. This transpires in #2: The Visitor, which is set less than two weeks after #1: The Invasion. The Andalite Chronicles is said to take place 10 years after the 1966 Yeerk exodus of The Hork-Bajir Chronicles and 21 years before Elfangor met the Animorphs. This places it in 1976, meaning the Animorphs met Elfangor in 1997.
  4. The Visitor