User blog comment:MrAnonymous/Do you think it could be Ra's Al Ghul?/@comment-109.196.61.93-20130303045812

I think it's the same mastermind on the island (Fyers' employer) and in Nanda Parbat (Malcolm's teacher). And based on what we know it definitely sounds like Ra's al Ghul (purging a city by killing lot's of people 'for the greater good'/masterminding a war).

Also remember the time gap - Malcolm was trained around 1992 and the island happened around 2007. If both those things are elements of the same master scheme planned and prepared for so many years then it sounds even more like Ra's.

Keep in mind the realistic theme though - if it's him he'll be nerfed to a criminal mastermind without any superpowers. League of Assassins/League of Shadows would become his criminal organization (I just realized that Malcolm's costume resembles costumes of the henchmen from the League of Shadows from Batman Begins and Arrow bears significant resemblence in general to the Nolan trilogy) and Lazarus Pit would become botox.

If the overarching plot of Arrow is indeed Ra's' grand scheme then Oliver will probably just stop part of it and cause a delay. Then in next seasons it will either be a duel between them Sherlock Holmes - Professor Moriarty style or teaming up with other heroes from DC. The Batman family, Wildcat, Black Cannary... But now it's just a wild theory and I will probably be embarrassed for sharing it when the writers blow our minds with something completely different :)