When Peter and Quagmire accidentally switch underwear, they begin to mimic the other's behavior. Stewie and Doug agree to commit each other's murders.
Seth MacFarlane
Peter Griffin / Brian Griffin / Stewie Griffin / Glenn Quagmire / Tom Tucker (voice)
Alex Borstein
Lois Griffin / Tricia Takanawa / Loretta Brown / Barbara Pewterschmidt (voice)
Mila Kunis
Meg Griffin (voice)
Seth Green
Chris Griffin (voice)
Patrick Warburton
Joe Swanson (voice)
Arif Zahir
Cleveland Brown (voice)
