How to make a really 'evil' voice

Something out of a horror movie, just really deep and evil. I've fucked around with pitch and the basic cubase plugs but I'm not getting anywhere but cheesy shit

Most horror movie evil voices are over-dubbed to fuckery - often by more than one person, but matched timing-wise as closely as possible. Mixing a light female whisper, a low croaky male voice and a deliberately "evil" sounding normal voice will already get you most of the way there before you start adding effects - it's exactly how Dani Filth works, and his vocals definitely have that old-school horror movie vibe.

If you want *really* creepy, record the lines, reverse them, learn the backwards take, record that, reverse. That alone will sound creepier than anything some cheesy effect will, but once you add some reverse reverb, pitch-shifted and phased double tracks etc. on top it'll be truly terrifying.

Steve
 
Honestly, just quad-tracking vocals will do wonders for making something brutal. If you do pitch shifters, try doing the 3 voice, one normtal, one down, one up pitch shifts. I think i like Behemoth's approach on Demigod which sounds tri-tracked at all times. Or listen to Marilyn Manson's Antichrist Superstar (the song) for a 90's version of the pitch shifted thing.