'Matt Hagen... otherwise known as... Clayface!'

This moment, from the episode "Dead Ringer", might very well be the first time ever in audiovisual media that a member of the Rogues gallery is identified by real name. Anyone can think of an earlier example? The 1968 cartoon or Superfriends, maybe? I'm positive it never happened in the live-action series (King Tut doesn't count, he was originally created for the show).

Account inactive till original titles are back as default. Or Hell freezes over. What happens 1st.