The exact relationship between Thor and Dr Blake was always a bit fuzzy. The first tale suggests that Thor is an alias of Dr Don Blake, as Batman is to Bruce Wayne, but a bit more reflection reveals glaring metaphysical holes. I remember puzzling over it as a kid. Did Thor exist before Don Blake struck the cane? If not, then how to explain all those Boyhood of Thor stories that were such nice extras in the comics? Where was Thor when Dr Blake was fulfilling his medical duties? Or, alternatively, where was Dr Blake when Thor was jousting in faraway Asgard?
It all got a bit out of hand… Superboy was OK, but Supergirl/Dog/Cat… I ask you!!!