- 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 — S0E13
Episode: Elmo's World Opposites
Air Date: 2008-02-05
Overview
How do you go up and down on a see-saw? What types of things open and close? Which is faster, a tortoise or a hare? Elmo and his friends explore all kinds of opposites.