- 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 — S17E67
Episode: Introducing Leo the Party Monster
Air Date: 1986-02-18
Overview
Luis and Maria go about their business at the Fix-It Shop when they hear a loud tune blaring. In comes Leo the Party Monster, a monster who loves partying more than anything. Leo shows up again, asking to use the Fix-It Shop's computer to write out some invitations for a party at Bob's apartment. He promises Luis he won't do any partying while he works. Sponsors: J, X, 5