The center of the conflict between the Street Fighter and Tekken universes is a cubical object that crash-lands in Antarctica. The object is of a mysterious origin and researchers worldwide are unable to determine what purpose it serves. The only thing that can be understood is that when beings come into conflict around this object, it releases a water-like energy that brings more power to the combatants. Due to the object's tendency to react to conflict between beings, they name it "Pandora". Whilst a standard story is given to most combinations of fighters, specific teams, such as Ryu and Ken or Kazuya and Nina, receive their own unique story elements and rival battles.