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Penelope is a cute and very beautiful young girl that Stewie Griffin falls in love with in the Family Guy episode "Mr. and Mrs. Stewie". She serves as the hidden main antagonist in the episode.
Stewie meets Penelope in the park when he got pushed by a boy. She got revenge on the boy by giving him superglue laced taffy, presumably choking him to death. When Stewie plays at Penelope's house, he discovers that she has the same fascination in weapons as he does. However, she was actually successful in killing her mother unlike Stewie by decapitating her. Stewie instantly becomes infatuated with her, and together they cause chaos in several parts of the world. Brian Griffin notices that Penelope was becoming a bad influence on Stewie despite her cuteness and beauty. In the past Stewie's ambitions were to rule the world, whereas Penelope wants to cause war, chaos, and destruction to the world for nothing more than personal amusement. When Stewie tells Penelope that Brian told him not to see her anymore, she asks him to kill Brian. Stewie was not able to do the job, so Penelope decided to do it herself. Stewie intervenes and they both start fighting. They had a laser gun fight, and Penelope trapped Stewie with an anti-gravity gun, and Stewie used a gadget to reverse the polarity of the anti-gravity gun to escape. They both fought over the anti-gravity gun and fought in its beam until they wound up on top of a moving truck. When Stewie gets the upper hand in the fight, Penelope agrees to leave Brian alone. Then she kisses Stewie goodbye and rides off with a smile.