Actor Jack Riley was featured on the show over the years as five different characters: As Emil Dutton in episode #1.9, "Wonder Drugs"; in episode #2.10, "The Blizzard" as Warren Wilson, a gay man who hits on Dan; in episodes #4.5-6, "Dan's Operation", as Dr. Flick; in episode #6.12-13, "Clip Show", as Beepo, a psychotic clown; and in episode #8.19, "To Sleep No More", as Jim Wimberly, a cereal contest coordinator; Timothy Stack (three times); and Keye Luke (twice); among others, were also featured as different characters.