I believe that Super Mario Bros, The Legend of Zelda, and Metroid are all the same story of two guys chasing after one woman, but told from different points of view. Bowser is Link from Mario's point of view, Ganondorf is Mario from Link's point of view, and they keep fighting each other because they keep taking each other's girlfriend. However, the girlfriend's point of view is the Metroid games, where she doesn't want any of them.

My first piece of evidence comes from the Legend of Zelda games, where Link can be seen capturing fairies in bottles. Bowser can also be seen doing the same thing in Super Mario 3D World, which leads me to believe that they're the same person. They are also both green, but he would be exaggerated as a monster in Mario's story.

Next, I also believe that Mario is the same person as Ganondorf. I don't have a lot of evidence, except that Ganondorf has red hair and Mario wears red. But if Link is Bowser, then who else would Mario be than Ganondorf?

Finally, we come to the Metroid games. In the Metroid games, Samus fights many monsters, who I believe represent the men chasing after her. First, she fights Ridley, who looks beastlike, and could be compared to Bowser. Next, she fights Kraid, who is a dinosaur, which could be compared to Yoshi, Mario's dinosaur companion. The final boss is Mother Brain, who is Samus's controlling mother who wants her to get married.