The True Simers guide to the Sims 4 Expansion packs Game packs and discusion

The base game did have the alien aduptions, where male sims would be teleported up into a spaceship and impregnated and male sim had birth to the alien child, a pop up message came up and said do you want to keep the baby or send it to the homeworld. If you kept it the baby would just be a normal baby with green skin color, and if you didn't the alien would take it away. However Get To Work made them truely playable aliens with special powers.