I knew it. All the Apollo 13 command module pilots are secretly in league with the Devil!
How about Steve Buscemi? Talk about creepy.
John Makovich anyone?
Dangerous Laisons - sleazy Valmont.
In the Line of Fire - a psychotic assassin
Johnny English - with a bad French accent wanted to take over the British Throne.
I’m sure there’s more.
Thpbbpbpbt. 
Robert Vaughan.
His role as a good guy in The Man From U.N.C.L.E notwithstanding, just about everything else he has been in was as a sneaky double-crosser.
I can’t believe I forgot about Willem Dafoe. :smack:
Me too. NO matter how many smarmy bastards he plays (most recently in The Island]), he’s always Sharpe to me.
But he also played Jesus, and the Jesus-like officer in Platoon!
It’s hard to get more evil looking than Brian Thompson.
Then there’s Brian Cox, in Troy, X2, the Bourne movies, Rob Roy, etc.
He does get the Sharpe exemption, though, where he is more or less on the side of the good guys as Major Hogan.
Need a smug, pretentious asshole? Well, William Atherton is ready for you.
Cox was also the original Hannibal Lecter, in the movie *Manhunter * (later remade as Red Dragon, with Anthony Hopkins in the role).