Tobias and the other Animorphs discover that the Yeerks, a parasitic alien race bent on enslaving Earth, plan to test a device that could put an end to the Animorphs' fight against the Yeerks.
- ISBN10 0836827554
- ISBN13 9780836827552
- Publish Date 1 May 2002 (first published 1 September 1999)
- Publish Status Out of Print
- Out of Print 16 June 2021
- Publish Country US
- Imprint Gareth Stevens Publishing
- Edition Large type / large print edition
- Format Hardcover (Library Binding)
- Language English