Gil and Molly come across a museum holding a special exhibit on the Sphinx, and they ask the curator what happened to the Sphinx's nose. But he says nobody knows what happened, so Gil, Molly and the rest of the Guppies and Mr. Grouper try to solve the mystery while learning all about Egypt.
Molly tries to say "It's time for Bubble Guppies!" when she hears Gil nearby and sees him checking out an entrance to an Egyptain temple. He attempts to read the hieroglyphics but then Goby comes by wearing a crocodile mask to scare Gil before he and Molly say, "It's time for Bubble Guppies!"
Molly and Gil are on their way to school, then they see an opening of a museum exhibit on anicent Egypt. They
then notice that the Sphinx's nose is missing. They talk about that to the curator of the museum and he says that no one knows why the Sphinx has no nose. Molly and Gil then proceed to school telling everyone about it.