Sesame Street

Elmo is given the all-important task of watching over Rocco, Zoe's pet rock. When Elmo gets distracted, Rocco goes missing! Elmo has to follow the clues to find Rocco and save his friendship with Zoe. Also in this episode: The New York Jets' LaDainian Tomlinson helps Elmo explain the word "celebration." Brought to you by the letter R and the number 19.

Grover, Elmo, and Rosita are digging in the dirt and pretending to be Paleontologists. They imagine the items they've found might have once belonged to a dinosaur, but Chris teaches about the difference between actual fossils and ordinary stuff. If it's a dinosaur they're after, maybe they can create one using all of their finds -- has anyone ever heard of a Soup Ladle-O-Saurus!?

Who Can Wear the Most Hats on Their Head Day comes but once a year and Elmo and Zoe are ready for some serious sombrero stacking!