Idea I had for a long time about how human consciousness as we know it resulted as a complex form of parasitism by another organism. In the future, some people choose to have this invader organism expunged from their bodies and brains, and it results in a new form of human that is essentially a philosophical zombie that experiences neither pain nor pleasure.
The first movie would consist of the discovery of this organism and the emergence of this new type of human, along with how the older humans are starting to be outcompeted by this “original” human.
The second film would be detailing the degradation of material existence caused by this massive change, especially for the parasitized (fully conscious) humans. This would be by the lack of any true ability to experience pain or pleasure that the de-parasitized humans possess allow them to be more productive than parasitized humans.
The third film would detail the inevitable war and eventual departure of all de-parasitized humans from the planet, out into space, as they can withstand far more casualties and loss due to their novel nature (and thus innovate new tech far more quickly as a result).
Last shot would be my protagonist (played by Margaret Qualley in my dreams) gazing out on a vast fiery sea of fusion rocket launches as the de-para humans depart, saying something like, “There won’t be enough room for them out there, eventually. They’ll be back, and we’ll still be the same.”