• Jim Piersall as Arnold
  • John Piersall as Gerald
  • Mary Piersall as Sheena
  • Dr. Brown as Ernie
  • Mrs. Piersall as Helga
  • Young Jim Piersall as Dino Spumoni
  • Reporter Slade as Principal Wartz (uncredited)
  • Joe Cronin as Coach Wittenberg (uncredited)

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