Zone 91 is a human military base in the middle of one of Earth's deserts, which supposedly held a piece of an alien spacecraft. This made the Yeerks invading Earth very eager to shut down the project. However, the secret Zone 91 so carefully guarded was in fact a recovered "modular waste disposal system" - essentially, the toilet of an Andalite Dome Ship.[1]


  • Zone 91 is analogous to the realworld Area 51.


  1. The Unknown

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