Sesame Street: Monster in the Mirror

Oh no! There's a monster in Grover's mirror! Oh wait- Grover is a monster, so that's totally fine! Wubba Wubba Wubba Wubba Woo Woo Woo.
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Sesame Street is a production of Sesame Workshop, a nonprofit educational organization which also produces Pinky Dinky Doo, The Electric Company, and other programs for children around the world.