• 
  Jim Cummings

  Mr. Bumpy
• 
  Gail Matthius

  Molly Coddle
• 
  Rob Paulsen

  Squishington
• 
  Scott McAfee

  The Boy
• 
  Jennifer Darling

  Cute Doll
• 
  Janice Kawaye

  Little Robot
• 
  Anndi McAfee

  Little Sister
• 
  Elizabeth Daily

  Germ Girl

• 
  Burke Moses

  Bumpsted
• 
  Valery Pappas

  Cute Doll #2
• 
  Brad Garrett

  Big Mike
• 
  Danny Mann

  Phil Silverfish
• 
  Jeff Bennett

  Gloog
• 
  Sheryl Bernstein

  Additional Voices
• 
  Emma Blackwell

  Additional Voices

• 
  Gilbert Gottfried

  Odiferous J. Stench
• 
  April Winchell

  Auntie Matta