- 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 — S15E53
Episode: Mumford produces shapes
Air Date: 1984-02-01
Overview
The Amazing Mumford performs shape identification tricks while the Count discovers he can count letters in books. Forgetful Jones sits in wet paint and wears the sign. Sponsors: A, Y, 9