The lights are on
Or at least the "biggest, baddest, most awesome" unit in the game according to the Civilization V community site. That fellow up there is called the "Giant Death Robot," and he's sure to be the source of all sorts of turn-based problems for you.
With a combat strength stat of 150 and the ability to move after attacking, the only thing holding this big guy back is his attack penalty versus cities. Here's the Civilopedia entry on it:
"The 'Giant Death Robot' is a giant bipedal mechanical robot armed with a variety of missiles, Gatling gun arms, laser-beam eyes and a deadly kung-fu punch. Although not currently found in the modern battlefield, no doubt across the world governments and evil corporations are secretly developing these metal behemoths even as we speak. When these robots come into service, all of the world's other weaponry will become obsolete, and humanity's fate will be decided by a climactic battle between armies of good and evil Giant Death Robots in the streets of downtown Tokyo (assuming that the giant radioactive monsters don't get us first.)"
You'll be able to try this deadly machine out for yourself (or find yourself crushed by it) when Civ V arrives on PC next month.