• 
  Maya Angelou

  Herself
• 
  Pam Arciero

  Grungetta
• 
  Louise Gold

  Sally Messy Yuckyael
• 
  Marilyn Horne

  Herself
• 
  Richard Hunt

  Two-Headed Monster
• 
  Michele Mariana

  Cecille
• 
  Joey Mazzarino

  Ingrid (voice)
• 
  Jerry Nelson

  The Amazing Mumford

• 
  Roscoe Orman

  Gordon
• 
  David Rudman

  Humphrey (voice)
• 
  Caroll Spinney

  Oscar the Grouch
• 
  Christopher Cerf

  Singer (voice)
• 
  Kevin Clash

  Elmo / Natasha (voice)
• 
  Jim Henson

  Ernie / Barry Rhymie (voice) (archive footage)
• 
  Frank Oz

  Cookie Monster / Grover (voice)