Brains in Jars (The Legion of Super-Heroes)

Brain in jars?  How long has that been a thing?

I’m not sure, but it’s been a while.  Incidentally, I’m not just talking about regular (or Abby Normal) brains in jars, like in James Whales’ Frankenstein or Mel Brooks’ Young Frankenstein…I’m talking about sentient brains in jars.  Brains in jars that are still thinking and still talking…and usually still plotting eeeeevil.