I'm looking for a voice changing VST?

I am trying to find a simple VST to alter voice files. I wanting to create the classic cylon, robot, evil sound. Or any suggestions to accomplish this task.
 
Thanks for the help.

Izotope's VocalSynth maybe what you're looking for:
https://www.izotope.com/en/products/create-and-design/vocalsynth.html
I'd try the demo thoroughly first though. It's (oddly) not engineered for Sonar/Cakewalk (confimed with their Support people) but I managed to get it to work fine for a small vocoder effect I needed on a couple of words.  I didn't buy the full version because I thought for a relatively new and sophisticated product the artifacts were too plentiful for my liking, and nothing like the video demo.  I also have Nectar https://www.izotope.com/en/search.html?q=nectar which I bought for making vocal harmonies, but hardly use it because again the artifacts are awful and the harmonies it makes pretty useless.  I love Izotope's Ozone tool but the above products don't measure up to that standard IMHO.

Liquid Noise
I am trying to find a simple VST to alter voice files. I wanting to create the classic cylon, robot, evil sound. Or any suggestions to accomplish this task.
 
Thanks for the help.

For these sorts of sounds, normally a vocoder is used: https://forum.audacitytea..g/viewtopic.php?t=75791
 
Skyline_UK's suggestion of Izotope's VocalSynth is a good one - it's like a vocoder on steroids. You should be able to find free alternatives however.
 
Nectar 2 is more of a suite of traditional vocal effects, i.e. eq, de-sser, pitch correction, compression, reverb etc.
 
Antares EVO Throat / EVO Aspire are another type of effects, that change the character of your voice - i.e. make it deeper, change gender, add rasp or breath etc. It's good for making you like some one different, but it's not necessarily the best tool for robot type voices. Evil type sounds... definitely within its cope.
 
Finally, for really artificial voices you could try Plogue's AlterEgo, which is a VSTi that sings lyrics. There's 2 or 3 basic "vocalists" that you can the character of substantially. Basically you cut/paste your words or lyrics into the VSTi and it sings them to the tune you play on your keyboard.
 

https://tal-software.com/products/tal-vocoder
https://www.meldaproduction.com/MVocoder
https://www.image-line.com/plugins/Effects/Vocodex/

 

Can Melodyne produce the same results as Antares EVO Throat / EVO Aspire?
 

Polyverse Manipulator is the one I've been stalking and hoping for a good black friday deal:  https://polyversemusic.com/products/manipulator/
 
My TC Electronic Voiceworks+ hardware does a mean cylon.
 
Melodyne and some ring mod are good ideas too.

Pentagon I will do it.
 
Insert it in fx bin add a midi track with it's output to Pentagon. Copy/Drag vocal to midi track and/or insert midi notes to drive the effect and tweak away.

scook
I believe you are missing a step in setting up Pentagon I as a vocoder. Here are the instructions.

Correct as always scook = I forgot about the switching on the voice modulator bit. Haven't used it for a while and some new stuff must have pushed that bit out of my memory bank.

All good suggestions, but I'll second the vote for Polyverse Manipulator. I've been using it since it first came out, and it's been a blast. And it's on sale for Black Friday right now - $59 instead of $149.

Well, this is what is great about this forum. 
After reading this thread a few times I decided to also purchase Manipulator. Right now = $59.
I'll be having fun tonight, looks like cool plug-in.