Dude, this would never happen. Sailor Moon literally tanked a f**king GALAXY DESTROYING ENTITY! Peter Griffin is just some toxic asshole that is also surrounded by toxic assholes. Moreover, if anything, Doom Guy/Doomslayer would probably do a Gory Kill on Peter Griffin, and everyone that was on Family Guy, for revenge on a fellow demon slaying ally of his, and, ironically, with a chainsaw, or his new Shield Saw, hell, maybe both of them if he was pissed off enough at those people.
