Oscar the Grouch is a character on Sesame Street. He is performed by Caroll Spinney.
Night at the Museum: Battle of the Smithsonian
In Night at the Museum: Battle of the Smithsonian, Oscar the Grouch is among the exhibits at the Smithsonian Institution that is brought to life by the Egyptian Tablet. He and Darth Vader attempt to join up with Kahmunrah's group only to be rejected by Kahmunrah.