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Calvin began taking the identity of Stupendous Man when he became upset with his babysitter for sending him to bed. He began wearing a homade costume, referring to his babysitter Rosalyn as "Babysitter Girl" and worked to cause trouble for her. He would later use the identity to attempt get out of a troublesome situation at school, only to get into even more trouble with his teacher, who he dubs "Crab Teacher". The Stupendous Man identity would often be used to right perceived wrongs against Calvin, usually resulting in Calvin getting in even more trouble. In Stupendous Man's final appearance, Calvin donned the costume once after bemoaning the lack of real heroes in the world and decided that the "hero business is up to me."
The personality that Calvin created for Stupendous Man is supposed to be a supporter of justice, but it is very apparent that all of "Stupendous Man's" virtuous action's are really petty acts of revenge and rebellion on Calvin's part.