Gertrude "Mama" Nesbitt is Albert Nesbitt's 67 year-old mother who encouraged him to become a scientist. Whenever he became a villain, she went with the idea. Towards the end of the second book, she nearly killed Duncan when she rammed her car into him. She also fell out of the rocket at the end of the second book while wrestling with Gluestick. It is not known if she survived the fall, but most likely not.

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