User blog comment:San&Ashitaka/TITAN THEORIES/@comment-96.52.245.238-20131017052238

The first episode is called: "To You, 2000 Years in the Future."

Think about that for a second. We all think of the show as medieval, where its as though Titans swarmed the Earth during the middle ages. However, if we think of this as far in the future, we can think of advanced technology, space travel, and many other exciting possibilites.

In line with others, I'm inclined to believe that Titans were humans, changed through some mechanism--whether contaminated water supply, serum, etc--and who lose their humanity when the transition is complete. Interestingly, it seems they are now more like plants, based on certain factors of their biology.

Unlike others, though, I don't necessarily think humans were trying to make super-soldiers and came up with Titans. I actually think this is more of a "planet of the apes" style thing. Humans have an external enemy--the giant monkey people--who posed a massive threat to their survival. Whether the apes were aliens or something else is totally up for debate. However, these monkeys were capable of turning humans into mindless Titans. In retaliation, humans found some serum to make them giant but retain humanity, developing a Titan body controlled by a human rather than turning a human into a Titan. In their desperation, rather than fight back, they had the human-Titans create the Walls. Perhpas there were underlying reasons for this decision that we can't yet fathom. The monkey people, knowing that the walls posed a very real threat to them (due to the prescence of large intelligent human Titans), withdrew for a while. They decided to study the humans and gained support from select groups of humans, for whatever reason, who became pseudo-test-subjects. The monkeys wanted to perfect the same technology humans had--making a human into an intelligent Titan. Now, though, the human-Titans (i.e., Annie and others) would work for the monkey race and help exterminate the humans for good.