Rosalyn, also know as Roz, is a recurring antagonist in "Calvin and Hobbes". She is Calvin's baby-sitter, who tries baby-sitting Calvin for money in order to pay for college. When she is around, she threatens Calvin's death when he misbehaves (e.g., when Calvin takes her science notes and locks the bathroom door, she threatens that his parents will never find his remains). She is not intentionally a villain; she just doesn't want Calvin to be a handful, and she also intends to be able to save up for college.