Penny doesn't get quite as many opportunities to be badass in Gadget andthe Gadgetinis as she does in Inspector Gadget, but she does get her moments every once in a while: particularly she can get very dangerous if you threaten the people she cares about. Two that stand out are her taking down a giant mutant carnivorous plant with a pesticide gun in "Get Gadget," and remote controlling the Gadgetinis to give a gang of marauding M.A.D Agents just what they desrve in "Nice Guys Are Finished" (while clearly enjoying herself much more than she should), both times complete with Pre Ass Kicking One Liner. "Lets show these goons what happens when you mess with my Uncle Gadget!" indeed.
"Don't Call Me Gadget" has aliens place a chip in Gadget's head that will supposedly reverse his intelligence from smart to stupid. When the obvious happens, we truly see the full extent of what the cyborg can do when for the first time ever, a genuinely lucid Gadget decides to bring out the big guns! This may even lend some character development as Gadget had stated earlier that he despised violence, but operating at peak mental efficiency, the kid gloves are off.
Dr. Claw's moment comes in "Nozzaire's Day Off" when he easily steals Gadget's reboot disc from Nozzaire's safe and uses it to build a giant Gadget robot that actually gets to throw Gadget around a bit and would have squished him if it wasn't for Penny.