Hate to see your post going unanswered, but that's a loaded question around here. I haven't played with the TGC one, but you should be able to find an abundance of cheap or free sound effects for you bleeps sweeps a creeps.
As for voice, you could look at differnt text-to-speech programs (Speakonia) and voices and then use something like Audacity with free plug-ins to "tweak" the voice. I can't remember the name of the site but there are some voice actor websites you might be able to get some help from too.
Since there are some FLStudio users here, you might ask them if they could use the text-to-speech engine and grind out some lines for you. I used it for the attached file. Not perfect, but it will do.
If you are still stuck, I might be able to get a volunteer or two for you from the Audio Drama group I help out from time to time. If you want me to approach the group on your behalf, drop me an email with specifics.
-=Panabolic