Marc Maron decided to track down his arch-nemesis from Twitter and after a few hours of searching, he discovered that his name was Darryl and that he was originally from Colorado.
Darryl, aka "Dungeon Master", was played by Erik Charles Nielsen, who also plays Garrett Lambert on 'Community'.
'Community' takes place at Greendale Community College, which is located in... Colorado!
So I think we have a pretty clear case of identical twins here. Both Darryl and Garrett look exactly the same and we never learned Darryl's last name.
But it's clear that Darryl was the more dominant of the twins.....