- George Legenza as Big Bird
- Mary Simms as Abby Cadabby
- Lee as Susan
- Detective Sgt. Truscott and the film's narrator as Gordon
- William B. 'Bill' Phillips as Elmo
- Robert 'Bobby' Mais as Bert
- Madeline Welton as Gina
- Herbie Brooks as Cookie Monster
- Noyes Hinton - Gang Driver as Ernie
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