Separate names with a comma.
Alien The one that made me flinch the most had to be Alien (the original, not the sequels). It's the perfect blend of dark and foreboding...
The best weapon was the extendable arm from Bionic Commando. Haven't played the recent one, but the old school one was awesome.
Villian Vote The Joker all the way. Caluculating lunacy wins out all the time. A close second would be Hans Gruber from Die Hard.