Arrow is preparing to head into its fourth season, which means a new set of tests facing Oliver Queen and co. In three years the show has already burnt through a number of villains, especially in the first season when Oliver, as the Hood, was more than willing to kill his enemies. Its scaled back on the murder somewhat, but has continued to introduce a large number of foes for the Arrow. The most notable have been the overarching villains of each season - Malcolm Merlyn (season 1), Deathstroke (2) and most-recently the season 3 big bad Ras al Ghul. Those aside, there have been plenty of other recurring or minor villains who have also appeared, including the likes of Brick and Count Vertigo. It all means that the show has gone through a large number of Green Arrows rogues gallery already, but theres still plenty left for season 4. Last season ended with Oliver and Felicity headed away from Starling City, with the hero prepared to hang up his bow. Obviously things wont stay that way for too long, and hell have to be loading up with arrows once again soon. Heres a look at just who he may be targeting come October