The Coming of the Quantum Cats can - given different social conditions - develop completely different character traits (timid or assertive, benevolent or predatory, etc.) The title refers to the famous thought-experiment known as "Schrödinger's Cat", where the outcome of a real-world event depends on a quantum event. By some interpretations, the real-world object, in this case a cat, must be in two states simultaneously until it is observed. However, the story is more closely related to the many-worlds interpretation of quantum mechanics where all possible outcomes of an event occur, each in its own parallel universe. The same concept was treated, somewhat more pessimistically, in
Dead or Alive Ultimate 2", some changes to the music and remixes were added. Each character except Hitomi (which was introduced in "DOA3") has their own remix. The remixes only appear in the Dance Floor stage, The Ray House. The story mode of "Dead or Alive Ultimate" plays out as it did in the original. However, a new CG sequence is added further explaining the relationship and history of Ayane, Kasumi and Hayate leading into the first two Dead or Alive games. In 2004, after the release of "Dead or Alive 3", Team Ninja once again remade "Dead or Alive 2", this time for