Variations on the same theme

I can't remember if it was some wild speculation on a comm, or something in a fic, or just my brain being overactive on its own that sparked me thinking about it, but I did. It might just have been some stuff the Face said back at the beginning of S3, I think that was the when, at least, if not the how. I'd probably remember if I saw it again. But then exactly, I wondered just like Jack what he'd look like ages from now and... yeah. *shrugs* It made sense! Clearly. :p RTD AND I SHARE BRAIN CELLS. Or something.