Worse than Eddie Haskell?

Eddie gets most of the ink for being the GOAT when it comes to Sit-Com instigators (smarmy as could be, too) but Beaver's pal, Gilbert, he was just pure evil (in a cute sort of way, of course). And, unlike Eddie, he didn't try to hide it or charm his way out of messes (no, "you're looking very lovely today, Mrs. Cleaver", nonsense with this hombre). Too busy concocting his next dastardly move, I guess.............So, what do you say, can we at least give him an honorable mention?