He first appears in the episode "Q & A", in which he is an insane, obese genius with a severe case of Peter Pan Syndrome who seeks revenge on the people he blames for rigging his last question on Think Thank Thunk, a game show on which he competed when he was a child.
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In The New 52 (a reboot of the DC Comics universe) as part of the Forever Evil storyline, Cluemaster is among the villains that the Crime Syndicate of America recruited to join the Secret Society of Super Villains.