Operating system (O/S) units allow one-time character upgrades to be made (e.g. permanent health enhancement).
Cuse correctly guessed Ken Leung, who had guest starred as one-time character Carter Chong, a young and angry mental patient.
Parallel to the episode's main plot, where Poochie is introduced on The Itchy & Scratchy Show to boost its ratings, the writers inserted the one-time character Roy, a college-aged man who is shown to be living with the Simpsons, with no explanation as to his character or presence, as a reference to the executives' proposal.
Albert Brooks, in his fourth Simpsons appearance, guest stars as the voice of Hank Scorpio, who is one of the most popular one-time characters on The Simpsons.
MacFarlane also provides voices for various other recurring and one-time characters, including news anchor Tom Tucker and Lois' father Carter Pewterschmidt.
Several actors for one-time characters like the lobster gal in "Hot and Bothered" and Percy The Praying Mantis in "The Road to Damascus" were also cast for their respective real-life disabilities.
Roswell went on to voice other recurring characters on the show, such as Helen Lovejoy (the reverend's wife), Miss Hoover (an elementary school teacher), and Luann Van Houten (a housewife and mother), as well as several more one-time characters and background characters.
Vicki Lawrence: Harvey said to me one time, "Any character you play is a part of you".
One time, our main character 'died' at the end of the play and the drunken Queen came off the thrown to give him REAL CPR.
One time an especially scandalous character dropped trou, and I still for the life of me don't know why.
