As the Metropolitan Museum of Art closes, Big Bird decides to leave his Sesame Street friends behind in search of Snuffy. Once locked inside for the night, educational hilarity ensues as Big Bird and Snuffy team up to help a small Egyptian boy solve a riddle - as the rest of the cast searches for their big, yellow friend.
Caroll Spinney
as Big Bird / Oscar the Grouch (voice)
Martin P. Robinson
as Mr. Snuffleupagus (voice)
Frank Oz
as Bert / Cookie Monster / Grover (voice)
Jerry Nelson
as The Count (voice)
Richard Hunt
as Muppet Performer (voice)
Brian Muehl
as Telly Monster (voice)
Bryant Young
as Mr. Snuffleupagus
Jim Henson
as Ernie (voice)
Linda Bove
as Linda
Northern Calloway
as David
Loretta Long
as Susan
Sonia Manzano
as Maria
