The Animorphs are fighting to save the world from parasite aliens called Yeerks. Yeerks are the main antagonists in the series, but the protagonists also interact with other evil entities such as the superbeing Crayak. The main Yeerk antagonist is Visser 3, leader of the Yeerk invasion on Earth.
Animorphs was created in 1996.
The ISBN of The Hidden - Animorphs - is 0439106788.
The Sacrifice - Animorphs - was created in 2001.
The ISBN of The Experiment - Animorphs - is 0590762613.
The Unexpected - Animorphs - was created in 2000-07.
The Unexpected - Animorphs - has 143 pages.
The Separation - Animorphs - has 158 pages.
The Separation - Animorphs - was created in 1999-07.
The Mutation - Animorphs - was created in 1999-11.
The Mutation - Animorphs - has 142 pages.
The Resistance - Animorphs - was created in 202000-10.
The Resistance - Animorphs - has 141 pages.