Arthur Brown was a failed game show host. He is frequently imprisoned in Blackgate Penitentiary, and also has an estranged daughter, Stephanie Brown, alias the masked vigilante Spoiler. He turned to a life of crime, leaving trademark clues as to his actions. Cluemaster has a number of plasti-glass pellets attached to the front of his costume that he can hurl as weapons. These pellets variously contain a blinding incendiary flare, smoke bombs, paralyzing gas, and high explosives. First appearance: Detective Comics #351 (May, 1966)

This character thinks and acts as if he were better than everybody around him. He may not necessarily be unfriendly or rude about it, but he has an attitude of assumed superiority. This is different from Conceited, in that Conceited is an attitude of "I am just so much better than you are!", and this Disadvantage is an attitude of "I am just so good!" Player characters should only take this Disadvantage at the Moderate level for similar reasons as the Antisocial disadvantage.