Read more about Cluemaster at: Wikipedia

Official Site: DC Comics

The Cluemaster is a fictional character, a DC Comics supervillain who was an enemy of Batman. A failed game show host, he became a criminal who left clues to his crimes, though unlike the Riddler's, they were not riddles.

The Cluemaster starts his criminal campaign by a daring but unsuccessful attempt to learn the secret identity of the Batman, in order to gain a fighting edge. He returns to Gotham for a rematch with Batman, then appears in several supervillain crowd scenes over the years.

With several other villains, Cluemaster becomes a member of the Injustice League, a team of out-of-luck supervillains who, when banding together, become even less successful than they have been in their individual careers. The Injustice League is defeated time and again by the Justice League International, at least when they are not making laughingstocks of themselves. Trying to reform, the members later become the core of the equally laughable hero team Justice League Antarctica. They help out the Justice League when JLI liaison Maxwell Lord lies in a coma, but again later reform as the Injustice League as henchmen of Sonar.

Cluemaster makes his grand reappearance in Detective Comics #647 by Chuck Dixon and Tom Lyle. In this three-issue story, Cluemaster has reformed and been released from Blackgate Prison. Cured of his compulsion to leave clues, Cluemaster originally joins a gang and plans their heists in exchange for 10 percent of their winnings. He later kills the leader by suffocating him with a strong polymer over his mouth and nose, and begins to plan a master heist.

Cluemaster has not been a contender in any CBUB matches.