Probably one of those DC characters so obscure that Mark Waid hadn't heard of him.
Holy crapola, Batman. What a convoluted mess of a story. And I'm speaking as someone who grew up with and loved Silver Age DC. I'm starting to remember why I rarely, rarely bought House of Mystery and its illegitimate step-brother, House of Secrets.Let's just leave the kinda weird story with a moral to ACG, shall we?