Negahban will appear in episode five and is described as a formidable foe. Meticulous, driven, and deadly, Al-Owal, whose name in Arabic means "The First," is after someone very close to Oliver. Oh, and the man knows how to handle a scimitar.

DC Comics fans will surely geek out over Al-Owal's membership in the shadowy League of Assassins, which is headed up by Ra's Al Ghul, one of Batman's greatest foes (played by Liam Neeson in Batman Begins). Guess who else was a member of the League? Merlyn, who planned The Undertaking to destroy the Glades.

Negahban, who is also known for his work on 24, is just the latest actor to join the CW hit for its sophomore outing: Dollhouse alum Summer Glau will recur as baddie and Caity Lotz will join the series as the Black Canary, who is also Laurel's (Katie Cassidy) sister. The series is also looking to introduce Dr. Brett Allen aka The Flash, who has the potential to land his own spinoff.

Arrow returns for its second season on Oct. 9 on the CW.