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)
Frank Oz
as Bert / Cookie Monster / Grover (voice)
Jerry Nelson
as The Count (voice)
Martin P. Robinson
as Mr. Snuffleupagus (voice)
Brian Muehl
as Telly Monster (voice)
Richard Hunt
as Muppet Performer (voice)
Jim Henson
as Ernie (voice)
Ivy Austin
as Angels (voice)
Linda Bove
as Linda
Northern Calloway
as David
Loretta Long
as Susan
Sonia Manzano
as Maria
