I'm assuming you're talking about the beginning of the episode 'PTV' (UK Season 5/US Season 4).
the 100 episode was stewie kills Lois now the next one is Lois kills stewie
This happens in Stewie Griffin: The Untold Story.Specifically it's the episode, Bango Was His Name-O
Stew-Roids
the episode name is Stewie B. Goode which is Season 4 Ep. 28 Also the first part the Stewie Griffin: The Untold Story
get the poisen out is the name of the bully beatdown episode when mayhem fights the bully
The episode is called Not All Dogs Go to Heaven (Season 7, episode 11 if you need to know.)
Season Five | Episode One | Stewie Loves Lois
It is called "Road to Rhode Island"
Love thy trophy
Stewie Griffen the untold story
There are three episodes the first is Red carpet premiere and opening,Stewie B. Goode and Bango Was His Name, Oh!
Stewie first meets Bertram in the episode "Emission Impossible"