Some background on Green Arrow was revealed in the episode Vertigo. In this episode, it is explained that Oliver Queen does "run a big company in Star City." Later in the episode, it explains how a young Oliver Queen was on his yacht when he ran into some fog on his way, and he started to feel dizzy. He saw another ship, and it had on it Count Vertigo. It then explained how he was stuck on a deserted island for two years, and became Green Arrow. The episode goes on to tell how he wants revenge on the Count.