Perhaps the first well rounded episode which has a discernible beginning, middle, and end... maybe.

Roko's Basilisk is touted as the most dangerous, terrifying thought experiment. https://rationalwiki.org/wiki/Roko's_basilisk

But what if this AI is not an external machine willing its power upon us, but instead it is us, in each of us? What if it's already here? These are the questions.