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That nitroglycerin was medicine for Robert's congenital heart defect.
~ Dame Judith Underdunk lying about her son on trial.

Dame Judith Underdunk is a minor antagonist for the The Simpsons episode Funeral for a Fiend. She is a wife of Robert Terwilliger Sr. and a mother of Sideshow Bob and Cecil Terwilliger. She has a daughter-in-law named Francesca Terwilliger and a grandson named Gino Terwilliger.

She is voiced by Tress MacNeille.


When Sideshow Bob was put on trial for trying to kill the Simpson family, his parents helped him to avoid the prison. At first, Mr. Terwilliger claimed it had actually been Bart who had taunted Bob, causing everyone in the courtroom to believe it is all Bart's fault. When broken Bob pulled out a vial of nitroglycerin, Bart grabbed it and threw it out of the window (believing it to be a biological weapon). However, Judith Underdunk later revealed it is actually Bob's medicine he needed to cure his mental problems. And as Bart took it away from him, Bob fainted off and "died".

This helped Bob to conduct a complex plan to kill Bart by locking him in Bob's coffin and cremating him. However, this process was stopped by Lisa on time and Bob with his entire family ended up in prison.


  • Gino Terwilliger and Dame Judith are the only members of the Terwilliger Family who aren't voiced by guest stars.
  • As mentioned by Lisa, she is the best classical actress of her generation and her successful career obviously led Sideshow Bob to love theater and Shakespeare.
  • Sideshow Bob gets his hair from his mother and Cecil Terwilliger's nose is similar to hers.
  • The Dame prefix on her name means that she has been knighted.


               The Simpsons Logo.svg Villains

Springfield Republican Party
Mr. Burns | Birch Barlow | Lindsey Naegle | Count Dracula | Blue-Haired Lawyer | Waylon Smithers

Terwilliger Family
Cecil Terwilliger | Dame Judith Underdunk | Francesca Terwilliger | Gino Terwilliger | Robert Terwilliger Jr. | Robert Terwilliger Sr.

Springfield Mafia
Fat Tony | Fit Tony | Johnny Tightlips | Legs | Louie | Don Vittorio D'Maggio | Frankie the Squealer | Johnny the Snitch | Nicky Bluepants Altosaxophony | Joey | Dante Calabresi Sr. | Dante Calabresi Jr. | Primo | Shotgun Pete

Environmental Protection Agency
Russ Cargill

Globex Corporation
Hank Scorpio | Miss Goodthighs

Recurring Characters
Agnes Skinner | Artie Ziff | Baby Gerald | Constance Harm | Dolph Starbeam | God | Hans Sprungfeld | Herman Hermann | Itchy | Jessica Lovejoy | Jimbo Jones | Kearney Zzyzwicz | Jack the Ripper | Mr. Largo | Nelson Muntz | Patty & Selma Bouvier | Senator Mendoza | Snake Jailbird | Space Mutants | Wainwright Montgomery Burns | Gina Vendetti

Treehouse of Horror
Bart (Fly) | Burnsiverse | Count Burns | Zombies | Gremlin | Groundskeeper Willie | Homer's Clones | Hugo Simpson II | Jonathan Frink Sr. | Kang and Kodos | Killer Toupée | King Snorky | Killer Krusty Doll | Lard Lad | Muttonchop Murderer | Ned Flanders | Seymour Skinner | The Blob | The Devil | Dr. Julius Hibbert | Bill the Kid | Moe-Looking Satan | The Grand Pumpkin | Witch Marge | Rachel | Maggie Simpson

Guest Star Characters
Will Wright

Other Characters
Adil Hoxha | Adolf Hitler | Andy Hamilton | Baby Button Eyes | Bart Simpson's Creatures | Blue-Eyed Man | Bob Arnold | Captain Mordecai Barrows | Cesar & Ugolín | Chett Englebrick | Clownface | Cooder | Comic Book Guy (Brick Like Me) | Devan & Quenley Woosterfield | Dexter Colt | Dwight Diddlehopper | Frank Grimes, Jr. | Francine Rhenquist | French Chef | Glamorous Godfrey | Howard K. Duff VIII | Ironfist Burns | Jack Crowley | Jack Lassen | Julia | Hell's Satan | Kindergarten Teacher | Larry Kidkill | Lucille Botzcowski | Sparklemon | Lyle Lanley | Les Moore | Jim Hope | Mav & Portia | Molloy | Movementarians | Mr. Dirt | Nigel Bakerbutcher | Officer Krackney | Professor Werner Von Brawn | Rex Banner | Robotic Richard Simmons | Shadow Knight | Stanley DeGroot | The Leader | William Shakespeare | Jay G | Kostas Becker

Video Games
Simpsons Arcade
Hench Dogs | Robot Burns | Mr. Smithers

The Simpsons Game
Matt Groening | Lard Lad | God | King Snorky | Patty & Selma Dragon | Stubborn Ape

The Simpsons: Tapped Out
Mr. Burns | Russ Cargill | Frankie the Squealer | Sven Holly | Evil Homer | Bandits | Count Dracula | Rich Texan | Fernando Vidal | Grampasaurus