Who's the most awesome villain of all time?S

Everybody knows that in most science fiction and fantasy universes, the villain is way cooler and more interesting than the hero. But who's the coolest and most badass villain of all time? You decide!

Please include a photo or clip of this baddie, so we can admire him/her/it/them. And yes, this can include monsters and alien races, along with artificial intelligences. Thanks!

Further reading: