The Guardian is the final villain of the "Ultima" series of computer role playing games. He is also the series' most frequently recurring villain, being the only character to feature as the main villain in more than one game. In "Ultima VII", "VIII", "IX" and "Ultima Underworld II" he is voiced by the actor Bill Johnson. Wikipedia
The definitive Wikipedia entry for Guardian. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Guardian_%28Ultima%29