- Frank Oz (Bert)
- Sonia Manzano (Maria Figueroa Rodriguez)
- Roscoe Orman (Gordon Robinson)
- Martin P. Robinson (Telly Monster/Aloysius Snuffleupagus/Irvine/Slimey (voice))
- Suki Lopez (Nina)
- Violet Tinnirello (Charlie)
- Jennifer Barnhart (Zoe (voice))
- Ryan Dillon (Elmo (voice))
- Alan Muraoka (Alan)
Sesame Street — S17E111
Episode: The case of the missing round objects
Air Date: 1986-04-21
Overview
Big Bird delivers detective-style narration over scenes of the street, claiming today was just like any other day. Big Bird finds Maria about to play tennis, but her three tennis balls disappear behind their backs one by one. Sponsors: C, S, 6