Season 4 Episode 4
For anyone else who was as confused as I was here's parts of a link that explains what happened:
https://www.msn.com/en-us/entertainment/news/westworld-season-4-episode-4-s-timeline-twist-ending-explained/ar-AAZGs2H
Maeve and Caleb's Golden Age breakout fails spectacularly. Accosted by the Men in Black, Maeve uses her powers to remotely detonate the explosives dotted around Charlotte Hale's "park extension" construction site, and they're buried under the rubble. Caleb, meanwhile, believes reinforcements are coming, but the onrush of soldiers is actually a squad of bad guys who put him down and rescue Hale. Caleb wakes up a whole 23 years later to find hosts have taken over the world, and Hale is in control.
Westworld season 4 has glossed over the downfall of civilization, then, but Hale's exposition does at least provide enough breadcrumbs to figure out exactly how humanity was beaten. It all started with the Golden Age park's fly experiment. Guests were infected with the black goop parasite, which was then transmitted throughout the population like any other virus - Westworld boldly playing on COVID-19 fears here. According to Hale, the process was imperfect at first, with some humans able to resist the flies' programming. Caleb himself demonstrates this through much of episode 4. Fortunately for Hale's hopes of global domination, Delos' flies just loved kids, and after the old-timers died out, the next generation grew into the perfectly complicit human race Hale envisioned. This explains Westworld's "Generation Loss" episode title - the generation lost to subservience under hosts.
Hale's takeover could certainly be the apocalypse Rehoboam predicted back in Westworld season 3. Incite's AI program anticipated human extinction was nigh, and by adding Westworld season 4's latest time jump to the 7 years between seasons 3 & 4, the current timeline sits somewhere between "population collapse" and "end of human civilization." Maybe Rehoboam predicted that hosts would succeed in overthrowing mankind if humans were left without its own guidance.
the Caleb Westworld viewers know and love dies on a Delos construction site.
Rather than let a good test subject go to waste, however, Hale has repurposed Caleb's mind to continue the immortality experiments started by James Delos. As revealed in Westworld season 2, the company's founder believed he could cheat death by programming a human mind - memories and all - into an artificial host body, thus extending natural life. The Man in Black undergoes this process in the far-future but, as of yet, no one in Westworld has managed to transfer authentically by passing the dreaded "fidelity test." Hale claims 278 (presumably failed) Calebs have been attempted during the 23-year time jump.
Westworld's "fidelity test" hosts aren't the same as regular hosts. Caleb should retain his same personality and memories from before, but that's assuming #278 doesn't fritz out like most human transference hosts seem to.
Bernard and Stubbs' timeline is happening 30 years after Westworld season 3,
these young adults (who would've all been children when the takeover began) avoided the flies or proved immune, then banded together to strike back against Delos. The drones floating over the desert (not to mention the hosts Bernard killed at the diner) prove how desperately Hale's hooligans want these rebels caught.
The "weapon" Bernard helps the resistance dig up turns out to be Maeve
Buried under tons of dirt during her fight against the Man in Black, Maeve has spent the past 23 years out of action, but those host pearls - their digital brains - are notoriously difficult to destroy. Someone with Bernard's knowledge could almost certainly bring Maeve online again.
the resistance fighter Bernard and Stubbs met in a diner parking lot is actually grown-up Frankie, Caleb's daughter, who is now around 30-years-old
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