Ra's al Ghul was indeed the villain in "Batman Begins" (2005), the first in the recent series of films in which Christian Bale starred as the Caped Crusader. What you've hit on here is the fact that Batman and "Arrow's" main character, Oliver Queen, inhabit the same fictional universe.

Both started as comic book characters before ever going on screen. In the DC Comics series, Oliver Queen's superhero alter-ego was named Green Arrow.

He and Batman are members of the superhero team The Justice League (along with The Flash, another character now appearing in a CW series).

Since they exist in the same universe, it makes sense that they would occasionally have to fight the same supervillains. One of the biggest supervillains in the DC Comics stable is Ra's al Ghul. (Good try on the name, by the way -- it's hard when you only hear it spoken.)

Interestingly, though, it seems that Ghul and Green Arrow never went head to head in the comics (at least not according to the Internet's various comic book experts -- DC has been publishing comics with Green Arrow in them since 1941, so it's hard to keep track).

That said, Green Arrow has had plenty of run-ins with The League of Assassins, the criminal organization that Ghul leads.

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