Inspector Gadget, Penny, and Brain
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Oh Gadget, you lovable klutz.
I vividly remember as a kid, singing the "do do do do do, Inspector Gadget!" along with the tv while my mom brought the warmth of my tomato soup lunch into the room. I would laugh along as Gadget naively bumbled his way hilariously through the episode as Penny and Brain faithfully braved the dangers and virtually solved the case behind his back... with just enough time for Gadget to pop up and hand over the disheartened MAD Agents to the Police Chief of course.
"Oh, Penny! What are you doing here?"
None if this is to say Gadget was useless by any means. Quite to the contrary, the exploits of the ever-optimistic Inspector were a constant distraction and frustration to Dr. Claw, with Gadget often unknowingly uncovering vital clues, as well as taking key MAD Agents out of the picture. If not for his work, I doubt many of the cases would be solved at all.
And I'd regret not thanking the late Don Adams for lending his wonderful voice and charm to the ol' Inspector, as well as providing a great deal of inspiration for the show I'm sure. :)