The Sesame Street gang have gone on a field trip to the Metropolitan Museum of Art. Big Bird has arranged to meet with Snuffy at the museum but before he can, it is closing time. Big Bird decides to go off and look for Snuffy. Before the group can leave, they realize Big Bird is missing and run all through the museum looking for him. The chase has them going through different exhibits at high speed and missing, spotting, and chasing him. After a bit, they give up, only to find that they are locked in the museum overnight. They decide to go back out and look for Big Bird and look at all the exhibits while they are at it.