Doc's old mentor is the clone of Benjamin Franklin.

Ben Franklin taught at the college Doc went to. Through the use of cloning technolog similiar to what created him he and Doc were able to create dozens of clones of McNinja to study for numerous degrees which would later be recombined into the original McNinja

Ben gets cranky and says bad words. If he tells you to 'Censored' then that makes you a duke.

After making the deal with Dracula which allowed him to cheat death for the second time he's finds he is being stalked by a horse. Ben's purpose was to die so Dracula could find out what the afterlife was like.

He is currently in the waiting room of the afterlife. Given his schemes though, he'll probably be back.