OK K.O. wiki information:



"Jethro is a very simple robot created by Lord Boxman. In the series, his first appearance was in "Let's Be Friends" as a cameo, but made his first major appearance in "Jethro's All Yours". In the show, Jethro is known to be very weak and is not considered a threat by most members of the plaza, as he can easily be defeated by the slightest physical contact. He is a common enemy in both OK K.O.! Lakewood Plaza Turbo and OK K.O.! Let's Play Heroes."