- State's Atty. Henry L. Harvey as Elmo
- Madge Harvey as Abby Cadabby
- Chief Harold F. Robinson as Gordon
- Irene Nelson as Gina
- John Waldron as Oscar the Grouch
- Dave Woods as Big Bird
- T.M. Wade as Grover
- Mac McCreery as Cookie Monster
- Paul Harris as Frazzle
- Det. Lt. White as Farley
- Stone as Bert
- Whitney as Ernie
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