In the 1978 series Battlestar Galactica, humanity has been fighting the Cylons for a thousand years. Suddenly (and we not told how this happens), the human Count Baltar manages to bring the Cylons to the peace table. Somehow (and we are not told how he manages this), Baltar has managed to betray the human race so that he can become the ruler of what's left. (Better to reign in hell than serve in heaven.) The Cylons managed to sneak a fleet of Raiders into the Colonial solar system, and wipe out 11 of the 12 "battlestars" protecting humanity -- with only the Galactica smart enough to distrust Baltar and the Cylons and escape.
John Colicos, a legendary character actor, played Count Baltar. In the first three-hour episode, "Saga of a Star World", he is sentenced to death by the Cylon Imperious Leader. In the second episode, "Lost Planet of the Gods", Baltar is not only given a reprieve but actually placed in command of three Cylon "base stars" -- ostensibly because only a human can out-think other humans. He pursues the Galactica pretty much for the rest of the show.
This is pretty much how you see Baltar for most of the series, sitting on his throne, face lit from below as he maniacally plans (and fraks up) for Adama's demise.