I know how to. I'm already finished The Sims 2..
1) After completing your goal(Confront Mister Smith...,Get the Alien Photo Album),Isaac Rossum should call you.
2)He would said "..........I found something in Doctor Dominion's house.. It was "Or4ngut4n" instead of A's , it was 4's. I think Doctor Dominion have a secret office there in the Division 47. I think this is a password on his computer............."
3)Go to Laboratory,Secret Sublevel,And the Computer
4)Then the computer would talk "Please enter your password."
5) Password:Or4ngut4n
6) Pass the 5 questions that only Doctor Dominion could answer.(TIP:READ SECRETS TO PASS OTHER QUESTIONS)
7)Get the Teleportion Unit
8)Fight DOCTOR DOMINION!!!!!!!!!!!
Hope This Helps!