• Hazel Grace Lancaster as Gabi
  • Augustus Waters as Bob
  • Isaac as Big Bird
  • Frannie Lancaster as Gina
  • Michael Lancaster as Elmo
  • Patrick as Big Bird
  • Lidewik Vligenthart as Susan
  • Peter van Houten as Bert
  • Mrs. Waters as Maria
  • Mr. Waters as Ernie
  • Dr. Maria as Zoe
  • Monica as Leela
  • John Green as Cookie Monster (cameo)

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