Tobey's babysitter refers to the babysitter of Theodore "Tobey" McCallister III. She was first shown on Tobey or Consequences as a sitter while Claire McCallister (Tobey's mother) was away on business.
She has also appeared as a background character in several other episodes. In Seize the Cheese, she was in a cheese store while Dr. Two Brains' ray was seizing the store's cheese. She was seen in Art in the Park, as one of the people reading and getting mind controlled by Mr. Big. She was also seen at a book signing in El Queso Mysterioso.
She is shown to be rather shy, but she enjoys talking to people who are willing to listen.