The Sims 2 Tips

Goons, Aliens, Robots... Usless
You dont have to fight when you hear from Concierge that there are aliens or robots or anything!
Just wait until the time to stop them is up.
They will disappear.
It is very unlikely that anything will happen to you except one or two people moaning at you.
Just calm them down and your done.
Don't waste your time getting rid of them.