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Aliens can be created via Create-a-Sim, and can also be born via Alien Pregnancy.

They are brightly colored when in their Alien form, but look normal when disguised. Half-alien sims born via normal pregnancy retain their bright colors.

Aliens can erase they memory of people who discover their identity, and can transmute collectibles, turning them into other elements. They can analyze other Sims' personalities, discovering their traits. Aliens can Empathize with other sims, taking on their mood. They can resurrect dead alien collectibles.