- “Mr. McClure, what does DNA stand for?”
Billy is Troy McClure's assistant.
He was supposed to appear in more episodes, but due to McClure's voice actor Phil Hartman's untimely death, he was retired along with McClure. He is a child who appears in Troy McClure's educational films. His movies include "Birds: Our Fine Feathered Colleagues", and "In The Kitchen with DNA". Billy also played a character also named Billy in the TV show McGarnagle.
- Episode – "The Boy Who Knew Too Much"
- Episode – "Lisa the Simpson"
- Episode – "Bart the Mother"
- Episode – "Homer vs. Dignity"
|Ms. Albright | Alice Glick | June Bellamy | Belle | Billy (actor) | Booberella | Colin | Cosine | Crazy Cat Lady | Michael D'Amico | David (Treehouse of Horror XVI) | Devan Woosterfield | Dia-Betty | Mia Farrow | Ginger Flanders | Mrs. Glick | Adil Hoxha | Bernice Hibbert | Cookie Kwan | Lester | Audrey McConnell | Medicine Woman | Mrs. Muntz | Lindsey Naegle | Manjula Nahasapeemapetilon | Opal | Poor Violet | Lois Pennycandy | Pepi | Phillips | Brunella Pommelhorst | Ronaldo (Blame It on Lisa) | Dr. Simpson | Agnes Skinner | Brandine Spuckler | Jitney Spuckler | Whitney Spuckler | Spud | Dolph Starbeam | Clara Stetson | Gino Terwilliger | Dame Judith Underdunk | Veronica | Vicki Valentine | Plopper | Princess Diana|