The Undergraduate Married with Children : Season 9 Episode 28

Kelly's new secret admirer turns out to be a wealthy, spoiled, immature 12-year-old boy named Robby Bennett, who blackmails her into accompanying him to his middle-school junior prom. Bud also crashes the prom disguised as a music DJ to taunt Kelly until she finally cries out for help, and Bud saves her by contacting Robby's father--who eyes Kelly too.