Double Dragon has a dope back story.
We always think the story is:Two brothers, Billy and Jimmy Lee, wander through the streets of New York, beating up gangs. and the clichéd girlfriend gets kidnapped.
The real backstory is:
The game is actually supposed to take place in the post-apocalypse. They're both supposed to be martial arts masters protecting a sacred and secret style. And the woman? She's not just your helpless girlfriend: She's also an instructor named Marian who also teaches at the martial arts schooL.
The game manual also makes a specific point of mentioning that, though she's Billy's girlfriend, Jimmy has a thing for her too.
In the Famicom port's instruction booklet they're forced to close down their martial arts shop after the nuclear war kills most of their client base. Street gangs rise from the ashes of New York, and one such gang kidnaps Billy's girlfriend, Marian.
At the very end, after beating the boss, Lord Humungus, you get to randomly fight each other. As little kids it was fun for player 1 to fight player 2.
The truth is:
It's revealed that Jimmy is actually the one who secretly kidnapped Marian. So what you saw through child's eyes as a fun little section where you finally got to fight each other, you now know was a (possibly post-rape) struggle between brothers in a society that collapsed, leaving violence and death as the only laws.