WARNING: The following contains spoilers for Season 3, Episode 5, of Westworld, "Genre," which aired Sunday on HBO.

Since Westworld's first season, fans have learned that nothing about the show is what it seems. The series has played games with timelines, perspective, and memory. The entire second season had a repeating catchphrase about "questioning the nature of your reality." So by the time Season 3 rolled around, viewers were ready to assume that anything they were told was a lie, starting with the latest addition to the cast, a human named Caleb Nichols. Does his character bio say he's human? Then he's probably a host.

But throughout the first four episodes, everything about Caleb seemed relatively above board. There were a few red flags, to be sure. But, in a slightly ironic twist, it was the evil Rehoboam program that tipped the balance in favor of Caleb's being who he said (and believed) he was. The determination to keep him heading towards suicide seemed like the actions of an algorithm that recognized him as human. But then Liam Dempsey Jr. looked up Caleb's file, and his jaw-dropped response suggested maybe Rehoboam didn't know everything either.

RELATED: Westworld: Serac's Childhood Trauma Explains Rehoboam

What We Know About Caleb

In the opening episode of Season 3, Caleb is introduced as an army vet. By the end of the first episode, fans learn he's been participating in an experimental form of therapy where he talks to his dead buddy from his unit who didn't survive whatever got Caleb discharged. But there were some early red flags. His mother insists he's not her son. There's an implant in his mouth. He says point-blank has been shot in the head before. And of course, there was the daily wake up, that echoed the same shots used on Dolores and Maeve in the park.

But over the next few episodes, each of these seemed to have been given a logical explanation. Caleb's mother has had schizophrenia since he was a child. The implant is a form of brain stimulant, and everyone in the army gets one. The daily wake up echo is because Rehoboam keeps him on the same sort of modest little loop in real life that Delos kept the hosts on in the park. As for the being shot in the head, though no one knows what happened, it's a good guess this might be why Rehoboam has classified Caleb as having mental health issues.

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What Liam Dempsey Jr. Saw

If anything, Rehoboam's classification of Caleb tipped the scales solidly down on the "human" side of the equation. If he were not human, one would assume his file would not be worrying about keeping him from getting promoted or declaring him unfit for marriage or children. One would expect the algorithm would be covering him with red flags and directing Serac to pull him out as a chaos agent.

That is why Liam Dempsey Jr.'s horror at looking up Caleb's file makes no sense. Whatever he saw, it was front and center of the document. Moreover, whatever it is, it's not what Caleb expected either, though he did think what was in his file would frighten Dempsey. It's why he dared the billionaire boy to look him up. Though that too came with a startling revelation. Rehoboam is wrong about Caleb attempting suicide in ten years. He already did it, or as he puts it, he "swallowed my gun on some beach."

Dempsey's horror is enough to throw Caleb for a loop, and within a few seconds, he's asking what the hell the man saw. But Liam won't tell him, not then, and not later, not even after Ash shoots him on the beach. Liam Jr. dies in Caleb's arms, and all he says is, "You don't even know who you are."

RELATED: Westworld: What Rehoboam Actually Is - and Why It's So Dangerous

Who is Caleb Nichols?

Aaron Paul in Westworld Season 3

Westworld loves a good "secret host" reveal. It's been doing them every season, whether it's Bernard in Season 1 or Stubbs in Season 2. If Caleb turns out to be a host in Season 3, it would not be that big a surprise at this point. What would be a great twist is if Delos is populating the world with them, and Incite, Rehoboam, and Serac doesn't know it.

On the other hand, these "host" reveals are a bit predictable at this point. What was so great about Caleb being a human is Season 3 could then use him to show how the first two seasons of Westworld have been a parable for our own future. It's not just the robots trapped on little loops from which they cannot break free. If we allow large scale companies to mine out data, soon that will be all of humanity.

Can Westworld square this circle and make a "host reveal" for Caleb feel fresh? If they do, let's hope it's done in such a way not to undermine this season's message.

KEEP READING: Westworld: Serac's Connection to Delos, Explained