Gadget’s precocious niece. Inspector Gadget is her guardian and caretaker, though often she seems more suited to be his caretaker due to Gadget’s clumsiness. Unknown to any of the recurring characters other than Brain, she is a master of investigation and technology who is the one truly responsible for foiling M.A.D.’s schemes. Penny’s principal crime-fighting tool is a high-tech Computer Book capable of breaking codes, surveiling buildings and overriding practically any sort of machine or device. Using the book, Penny is able to monitor Gadget’s activities and – with Brain’s help – surreptitiously help him avoid numerous potential catastrophes that result from his absent-mindedness while uncovering the true nature of Dr. Claw’s plot and foiling it. Her name is Sophie in the French, Italian and German version.