• Jim Piersall as Big Bird
  • John Piersall as Elmo
  • Mary Piersall as Zoe
  • Dr. Brown as Gordon
  • Mrs. Piersall as Prairie Dawn
  • Young Jim Piersall as Ernie
  • Reporter Slade as Cookie Monster (uncredited)
  • Joe Cronin as Baby Bear (uncredited)
  • and more

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