Golden Android Amazo is a strong contender.
Blasted through the justice league AND the green lantern core without breaking a sweat. Only reason he's not ruling the universe is cause he doesn't give a shit. Also he basically knows everything about everything (except magic and human psychology apparently). (Justice League(2001); Season 3, episode 8)
This post was edited by CMBurns on Nov 20 2014 04:23pm