A.J. Slick is Steve's primary competition in the Pearl Bailey High School talent show in "The Talented Mr. Dingleberry".
During tryouts for the school talent show, Principal Lewis' frustration with poor acts cause a reduction in redundant acts and things are exacerbated when A.J. sabotages Steve's singing by slipping him Lemon Pledge to drink, Roger offers to help him put together a ventriloquism act instead and the tryouts go well. But when A.J. insults the pair, Roger appears with him in a darkened weight room. After he abuses the 'doll' further, Roger secures the door and drops a barbell on his throat, crushing his larynx.
He is one of the hall monitors in "The Hall Monitor and the Lunch Lady".