King Boo is the leader of the mischievous ghosts that tend to torment Luigi most of all in the ... While Donkey Kong may be the first enemy of Mario, Bowser has been the longest-running villain ...

Bowser debuted with Super Mario in 1985 as Mario's opponent and ... him in his plots to take down Mario. We first met King Boo in Luigi's Mansion in 1988, and the known antagonist has upheld ...