SHIELD: Look, I'm all for second chances, but he's as shady as they come. He thinks he was doing right because he was helping a guy who helped him. Always impossible to deal with. Unless you figure out a way to break 'em.
So far, there's a girl who claims to have been in Tartarus before coming here -- yeah, the Greek Gods. Another guy claiming to be Thorin Oakenshield. He did kind of look like Richard Armitage in The Hobbit movies. I saw someone claiming to be Janet Van Dyne, but she's long dead. There's a few scenarios: it's a bunch of delusional people who think they're fictional characters (in which case, we're among them), mass hallucination (likely from some sort of chemical agent introduced into the water), we have jumped dimensions and are now living in a post-apocalyptic wasteland, we're all dead and in purgatory, or this is the Matrix.