Major spoilers ahead for Silo season 4, episode 8.The term "gray goo" was not even introduced in Silo seasons 1 and 2. In season 3, however, it has become an essential driver of the overarching narrative after being introduced in the opening episode. Silo season 3's episode 1 first introduced the strange substance when Charlotte flew into a dark cloud with her US Navy crew over Iran.
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