Ma Mushroom invented the Knitmaster 3000 for The Daily Bumble, which takes bathtub drain hair and turns it into a hat. Larry destroys it by accident which angers Ma. She gets one of the Angry Eyebrows attached to her forehead, which then she plans on getting Larry for destroying her invention.
After LarryBoy defeats the angry eyebrows, she finally lets go of her anger after she gets a medal for saving the city with her invention.
Ma is a local inventor. However, she can occasionally be cantankerous and irritable.