• Jack Ryan as Elmo
  • Dr. Caroline Catherine Ryan as Susan
  • Kevin O'Donnell as Count Von Count
  • Sean Miller as Oscar the Grouch
  • Sally Ryan as Gina
  • Lord William Holmes as Big Bird
  • Rose as Zoe
  • Lieutenant Commander Robby Jackson as Gordon
  • Annette as Gabi
  • Marty Cantor as Ernie
  • Vice Admiral Jim Greer as Bert
  • Paddy O'Neil as Bob
  • Dennis Cooley as Luis
  • Geoffrey Watkins as Sherlock Hemlock
  • Sgt. Owens as Grover
  • Inspector Robert Highland as Cookie Monster
  • Charlie Dugan as Telly Monster

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