The Simpsons — Season 18, Episode 20

• 
  Dan Castellaneta
  as Homer Simpson / Abe Simpson / Barney Gumble / Krusty (voice)
• 
  Julie Kavner
  as Marge Simpson / Patty Bouvier / Selma Bouvier (voice)
• 
  Nancy Cartwright
  as Bart Simpson / Nelson Muntz / Ralph Wiggum (voice)
• 
  Yeardley Smith
  as Lisa Simpson (voice)
• 
  Hank Azaria
  as Moe Szyslak / Chief Wiggum / Apu / Comic Book Guy / Carl (voice)
• 
  Harry Shearer
  as Ned Flanders / Mr. Burns / Smithers / Skinner / Lenny (voice)

• 
  Stephen Hawking
  as Stephen Hawking (voice)
• 
  Rudolph Giuliani
  as Rudy Giuliani (voice)
• 
  Russi Taylor
  as Martin Prince (voice)
• 
  Marcia Wallace
  as Edna Krabappel (voice)
• 
  Karl Wiedergott
  as Additional Voices (voice)
• 
  Tress MacNeille
  as Voice on Radio / Brandine / Dolph / Shoquelle (voice)
• 
  Maurice LaMarche
  as Harvest Fest Worker (voice)
• 
  Pamela Hayden
  as Jimbo Jones (voice)

Writer:
John Frink

Director:
Matthew Faughnan