Bringing back Aliens in Base Game?

I know I sound like a b**** with my comments about stuff being realistic in the game, but I am so used to them having aliens that it has become normal in Sims gameplay. Who knows, they could be real?! I agree that we should have the option though to turn it on or off in our own gameplay and make abductions rare to happen, but possible

Agreed some things are just expected to be in the game now.

Yeah, I remember how angry I was when some zombies came to eat my beautiful veggie garden ;(....ehh, and I agree with a concept of aliens and supernatural creatures as a rare thing to meet in the game, maybe as some quest achievement?? Dunno.... males pregnancy, that was a thing, I want it back! Nooo... I neeeeeed it back, lol. XD

A good way of making em rare is to make very few ones that you would not find unless you were trying very hard to do it so. For example - i imagine that the mystic wolf from TS2 pets that turns you into werewolf stayed a secret for a huge amount of time before someone discoreved it.