Roscoe is a homosexual man who runs the Ajax Steel Mill and works for the Play-Doh Factory.
When Homer and Bart visited the steel mill (as part of Homer's effort to make sure that Bart was straight), Roscoe told them that the workers worked hard and played hard. When break time arrived, Roscoe pulled a chain which made music play and a disco ball come down from the ceiling, and the workers (who were all gay) started dancing with each other. Homer then ran away from the mill, taking Bart with him.
He was later seen at the Play-Doh Factory.