Voice Modulator/Disguiser Effect

Hi, everyone! I am looking for advice/suggestions on creating a voice effect, similar to the type you may have heard on the show “Delocated” or that one scene in “True Lies” with Schwarzenegger (Does anybody still remember that?)
The video here is the first in a series of episodes I plan to shoot, and while I’m not terribly unhappy with the result, I feel it could be much better. My biggest concern is how to distort John’s voice enough to make it unidentifiable, while still allowing his speech to be easily understood. The noise is also an issue, but that’s something I know how to improve now.
I’m not terribly well versed in audio editing, so any advice anyone may have is very welcome!