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Monster Girl is a comic book superhero in the Image Comics title Invincible.

Character biography
As the result of a curse, Monster Girl has the power to transform into a large, powerful monster; however, every time she does this (and then reverts to human form) she is physically younger than before. At the time the Invincible stories are set, she is mentally 29 and physiologically 12. She is a member of the new Guardians of the Globe. Monster Girl is known to be attracted to her teammate Bulletproof.

She is currently spending time with her teammate Robot, who has put his consciousness into a pre-teenage clone of Rex Splode. He has indicated that he is using his intelligence to devise a cure for her reversed aging.