I didn't double check but I believe it was "8 Simple Rules for Buying My Teenage Daughter"
Chat with our AI personalities
Boys Do Cry
if you don't want spoilers don't scroll down. . . . . . . . . . . . . . . . . . . . . . . . first stewie kills Lois and then it doubles up with the 101th episode where Lois comes back from the dead and trys to kill stewie then stewie becomes the ruler of the world and then Lois goes all sexy commando and has a f*****g awsome fight with stewie ending up kicking the s**t out of him then it turns out it was all imagination and stewie says "if that's what happens if i were to kill Lois then i better not" and then credits roll
Stewie first meets Bertram in the episode "Emission Impossible"
It's called 'Baby Not on Board' (US season 7/UK season 8)
Primarily in Mother Tucker but also in Roads to Vegas & Stewie Goes for a Drive