Pollination Technician
A Pollination Technician is a member of an alien civilization, who can be referred to as any member of the crew of the UFOs that abduct Sims stargazing through a telescope at night. A Pollination technician is the other parent to alien babies caused by abduction. They can impregnate male Humans with advanced technology.
Each neighborhood has its Pollination Technician. The Pollination Technician doesn't actually exist as a sim in the game, but as a set of DNA that is passed on to alien children.
The Pollination Technicians can only be found in family trees for pre-created families. If your own Sims gives birth with a Pollination Technician, it will as the alien impregnator, Pollination Technician without a number like 7 or 9