308.

The Riddler is a DC Universe supervillain and an enemy of the Batman. In 2009, he was ranked as the 59^th Greatest Comic Book villain of all time. The Riddler is obsessed with puzzles, riddles and word games. He enjoys forewarning Batman about the crimes that he plans to commit in a complex cipher. He is depicted wearing a domino mask with a green suit and a bowler hat. He is portrayed as a smooth talking yet a quirky character. Just like the Joker leaving joker playing cards at crime-scenes, the Riddler leaves a Question Mark.

In the antimatter DC Universe, the Riddler assumes the form of X in the Secret Society of SuperVillains . X is considered to be the smartest man alive. Eventhough he doesnot have superpowers, his IQ and knowledge of almost all the disciplines enabled X to be an effective fighter.

Identify X.