The Master is a villain from WCW. (World Championship Wrestling.)
In the show he was the leader of The Dungeon of doom ; a stable (WWF/E speak for a group of wrestlers) of heels (more WWF/E speak; basically the villain characters) who'd try to end Hulkamania
He is a main player in the "Worst Villain Tournament Ever". so far he himself has not fought in the tournament, mainly sending his minons to do his dirty work.