Spoiled billionaire playboy Oliver Queen is missing and presumed dead when his yacht is lost at sea. He returns five years later a changed man, determined to clean up the city as a hooded vigilante armed with a bow.

Oliver Queen: You have failed this city!
Oliver Queen: My name is Oliver Queen. For five years I was stranded on an island with only one goal - survive. Now I will fulfill my father's dying wish - to use the list of names he left me and bring down those who are poisoning my city. To do this, I must become someone else. I must become something else.
[Season Two opening]
Oliver Queen: My name is Oliver Queen. After five years on a hellish island, I have come home with only one goal- to save my city. But to do that, I can't be the killer I once was. To honor my friend's memory, I must be someone else. I must be something else.
[Season 3 opening]
Oliver Queen: My name is Oliver Queen, after five years in hell, I have come home with only one goal - to save my city. Now others have joined my crusade. To them, I'm Oliver Queen. To the rest of Starling City, I'm someone else. I am something else.
[Season 4 Opening]
Oliver Queen: My name is Oliver Queen. After five years in hell, I have come home with only one goal - to save my city. But my old approach wasn't enough. I had to become someone else. I had to become something else. I had to become the Green Arrow.