It's the clash of 80's cinematic intergalactic despots: Skeletor from the 1987 live-action Masters of the Universe, versus Ming the Merciless from the 1980 film, Flash Gordon!
Both tyrannical titans are probably the best things about their respective films (both flicks are favorites of mine, nonetheless) – as both Frank Langella and Max Von Sydow rise above their scripted dialogue with classy, sublimely sinister performances. Langella, in particular, shines, working through a thick, nearly immobile rubber mask.
But in a battle between ultimate evils, who would win?
Skeletor, with his army of Darth Vader-esque stormtroopers and the stolen power of Castle Grayskull, or the self-styled Emperor of the Universe, with his ability to control the weather of distant planets, brainwashing rays and fleet of art deco rocketships?
Place your bets, folks!
(Note – we're only taking about these particular versions of the characters.)