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Nanny Nightmare is a biochemist and super-villainess that first appeared in Growing Pains.


Originally, Nanny Nightmare's hair was purple. After being exposed to a modified version of her regressive baby powder formula, her hair partially whitened and she developed numerous wrinkles. She wears an orange dress with black stripes and an apron. However, later episodes show her returning back to her original appearance, presumably using her baby powder to return herself to normal.


Nanny Nightmare views every other person as "ill-mannered", and she thinks they must restart; meaning that all who are considered "ill-mannered" by herself are to be turned into infant children, so they can be reprogrammed to act properly in her eyes. Her views could be considered narcissistic, as she wants them to behave according to what she considers proper without regard for what they think.


Prior to her villainous career, Nanny Nightmare was a biochemist who was ridiculed by her peers for her scientific notions, leading her to view everyone else as "ill-mannered". Despite being ridiculed, she eventually developed her infamous baby powder, which she uses to reverse aging for everyone else. At some point, she moved to the Shoppë and resided in the daycare area.

Nanny Nightmare first appeared in Growing Pains, where she was found by Max Tennyson, who wanted to discipline his grandchildren for their behavior. Eventually, she used her regressive baby powder on Ben and Gwen; turning them into toddlers due to a flaw in her formula. Unfortunately for her, Ben and Gwen were able to prevent her from turning everyone into toddlers and she was accidentally exposed to a modified version of her baby powder that made her much older. She was arrested afterwards.

Shortly after escaping prison, Nanny Nightmare regains her youth and seeks out the Fountain of Youth to create a more potent version of her regressive baby powder using the fountain's water. She tests the new version on her henchmen, turning them into toddlers. In Baby Buktu, she transforms Max into a toddler and traps Ben and Gwen where she then reveals Tim Buktu drank all of the fountain's water and she is attempting to retrieve it from him. Eventually, Ben defeats Nanny Nightmare once more and forces her to make a cure returning Max and Tim to their normal selves.


Nanny Nightmare has developed a regressive baby powder formula that can decrease the age of a person, though it can be modified to increase age. She also uses an umbrella for multiple purposes, mostly as a propeller, parachute, and formula sprayer.


Ben 10

Season 1

Season 3

Season 4


A "nanny" is a person that one would hire to look after their children for a very long period of time (usually due to long term travel or work plans that force them away from home), while a "nightmare" is a terrifying dream. Nanny Nightmare is both a nanny and a nightmare, as she is a disturbed individual that seeks to cause harm to all who are "ill-mannered" in her eyes, and she mainly looks after her victims (that have been turned into infant children).


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