wow so all of them can be used at once? :O

So... were there actually four types of aliens in Sims 2. All that time? All this fifteen years there were four alien types? My world will never be the same.

@ezeliastarpuff and @Victor_tor There was only one type of alien in the original game but the very talented Fwiffo created a mod to let us have several different types instead. These five files will allow you to have four different PTs in your game. Once your male (or female, if you have a mod to allow female pregnancy) sim is abducted, the game will randomly choose between one of the four aliens to impregnate your sim. It may take a few tries, but eventually you can have every alien type bred into your sim population.

I would love to do my own aliens, do you have any social networks that could help me?