I'm going to be blunt upfront - The Big O is anime batman with mechs. Still with me? Let's go. Big O was a mainstay of Toonami when it originally was broadcast stateside along a slurry of generation-defining anime. It is a series penned by Hitoshi Ariga, whom you may know from uhhh freaking MEGA MAN? Pokemon too, I guess, but its clear that Ariga has a very specific style and he flaunts it and more with The Big O. Paradigm City - a city of amnesia where every single inhabitant inexplicably lost their memory collectively 40 years before the series begins - is presented to you in a noire style that was rare when it aired and even more so today; Roger Smith provides services as a "Negotiator" alongside his butler and a robotic companion, Dorothy. Throughout his day job, he encounters giant mecha - 'megadeus' - that he has to combat with a megadeus of his own - The Big O. This show utterly rips. It was so good on its airing (between its popularity in Japan and its thunderous success in the west) that the production company was commissioned to make 13 more episodes for a total of 26 episodes of a run. Its noire style makes this series timeless; It's unquestionably and absolutely worth your time, especially if you like really deep mysteries and - of course - big ass robots fighting.