American Dad! Episode 8.12 Naked to the Limit, One More Time

Roger pretends to be Jeff's (Jeff Fischer) imaginary friend so he can freely roam naked around the house with no disguise. But when big-mouth Jeff figures out that Roger is an alien, Stan issues an ultimatum: either Roger or Jeff must be killed immediately. Meanwhile, Steve (Scott Grimes) becomes insecure about the shape of his rear end.