[He's actually from very far in the past, but that was a stupid plot twist isn't something he has any way of knowing! At this point, he's starting to believe, unlike David, that there must be two worlds, at least two, because-- Yeerks? Slugs? Felix may trust the toasters as far as he can punt them with the gimp leg they gave him... but he has to assume they'd have mentioned parasitic brain slugs at some point.

So he considers David's question honestly, but he finds himself shaking his head.]

I don't think so. Skinjobs are made to be as close to human as... we are. [He glances up at David as he says this, a little reluctantly. He's closer to believing David's not a product of murderous robots, but...]

I mean, we've autopsied them extensively, and they're essentially indistinguishable from humans. We even tried to build a Cylon blood detector once, and it failed. So no slugs, no, um, aliens. [Honestly, aliens?] Not unless someone's been hiding something on a massive level, anyway.