I got thinking about the Final Fantasy series and just figured that this all made too much sense not to have been thought of before. However, I couldn't find an already written version, so I made one myself. Figured I'd post it here because I'd like to get some feedback and this is the Square Enix section, after all. Before we begin, I'd like to note that this stems mostly from the fact that two specific genres exist in the Final Fantasy series. Science fiction and, obviously, fantasy. From here on, there will be unmarked spoilers, so look away now if you don't want anything spoiled. Now, Final Fantasy I sets everything up. It's a world where magic is predominant over technology, but it is clear through Lufenia and many old ruins that technology was dominant earlier in the world's history. In particular, the Temple of Wind in the original NES version was depicted as a satellite in space. The Warriors of Light also discover the airship at one point, another clue to the world's technologically advanced history. The plot after defeating the Fiend of Wind and lighting up the last Crystal consists of the Warriors of Light being sent 2,000 years back in time and defeating Chaos, breaking the cycle that Garland started and setting the world back to normal. Based on the original NES version, the world only goes back to normal from the point where the Warriors went back in time. This is what my theory is based on, not the remakes where it goes back to normal all the way, rendering the whole game more or less noncanon. After that, it splits into two distinct continuities. In the first continuity, the airship is destroyed or stops working before anyone finds it and the story continues with magic as the dominant force. This leads to FFII, to III, IV, V, IX, and XII, all of which hold a distinctly "fantastic" nature to them. In the other continuity, once the Stable Time Loop is resolved, someone finds the airship that the Warriors of Light discovered and uses it to finally get to the northern continent, where he finds Lufenia and discovers more technology that they used. From there, technology became predominant, leading to Final Fantasy VI where Magitek has been developed because "real" magic has sort of gone away. After this, things get a bit more complicated due to implications that may or may not be purely coincidental. Final Fantasy X (and, by extension, X2) is heavily implied to take place in the same universe as Final Fantasy VII (and all spin-offs thereof), but on a different planet and as many as several thousand or even millions of years before. For example, the airship that Cid uses in Advent Children is very clearly based on the airships of Spira. The character named Shinra, therefore, is likely an ancestor of the Shinra family we know and love. A reference is also once made to using the planet's (Spira) "soul energy" for power, something that we saw become reality in Final Fantasy VII through the use of Mako from the Lifestream as fuel. Now, this is where a huge amount of conjecture comes in. Given the extremely small but big enough to be significant similarities between the Junction and Materia systems, it's possible that Final Fantasy VIII is a sequel to FFX, taking place far into the future, but still long before anyone goes out to colonize FFVII's planet. It's even possible that VIII and VII take place at the same time, VII on "the Planet" and VIII on what was once called Spira. However, for the purpose of this theory, I'm going with VIII being long before VII. Ultimecia did her thing and was pretty much foiled, but managed to scare the world into working on exploring the universe a bit more. Eventually, VII happens and many years later, all the Materia and Mako that Shinra screwed around with returned to the Lifestream. Years pass and the events of VII (and its spin-offs) fade into myth and are eventually forgotten altogether. In time, the Lifestream manifests as fal'Cie, which eventually split into two main factions, one that stays on the planet, now called Pulse, and another that decides the planet is too dangerous and works to build Cocoon. By this point, many humans have split off and decided to go with the Cocoon fal'Cie. Finally, because Materia and Mako have returned to the Lifestream, they have manifested in XIII as l'Cie sigils. So, what do you think?