Welcome Back Carter
Family Guy Season 9 Episode 3 (10/10/10)
While visiting Lois' parents, Peter walks in on Carter having an affair on his yacht. Initially, Peter uses his knowledge to blackmail Carter into doing ridiculous things, but accidentally reveals the affair to Babs and she wants a divorce. Peter tries to help Carter adjust to life as a bachelor, but all he wants is to return his wife, who reluctantly takes him back.