>>724021365
I think the Kings were turned into ghouls because the writers probably thought having just played straight Elvis impersonators would be too jarring for a TV show. But if they were also ghouls, that would be weird enough to work.
Maybe there was some radiation leak in Freeside, and the Kings all mutated.
It's still pretty cool to see them again.

I wonder if this promo art even necessarily means the kings are all ghouls?
It's possible it was just done for the visuals of this ad.
I mean, ghouls don't look like that in the show, anyway. So it's clearly not entirely accurate.