Then once in our solar system, then what?
You could pull out GURPS War against the Chtorr, and make it green
instead of red...
http://www.sjgames.com/GURPS/books/Chtorr/
It starts with unusual plague outbreaks (somewhat distracting humanity).
Meanwhile strange fungus appears in forests that grows like kudzu, then
small creatures and bushes, then larger trees and creatures... then more
organized creatures...
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