- 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 — S1E123
Episode: Big Bird Draws Letter R's (0123)
Air Date: 1970-04-29
Overview
Here comes Cookie Monster! A prank on Bert backfires on Cookie and Ernie. Cookie's call to his mommy ends when he eats the telephone. Song "One of These Things" and animated ABC song.