The Bill is the main character of the "I'm Just a Bill" Schoolhouse Rock! segment which first aired in 1975.
In "Mr. Griffin Goes to Washington", the anthropomorphic legal bill sings "They Call Me Bill" on the steps of the U.S. Capitol Building until he is scooped up by a street sweeper.
He is voiced by Jack Sheldon, who reprised the role.
While trying to join a skinhead gang for his safety in "Shanksgiving", Peter tries to psych himself up to shiv Cleveland by blaming him for the Bill becoming a law.