Heh, this is fun. For the "old reference" geeks amongst you Black Flame was a villain who operated in Kandor City and fought Supergirl, Mind-Grabber Kid is an old JLA foe (who tends to get referenced more than you'd imagine given his original one-shot status, something about the geeky outfit and name I assume), the Ant is an old 1960's Teen Titans foe (Love the "Oh no Batman's after me... Oh no Batman's after me..." "Correction.. AQUAMAN is after you" scene! :) ) and Clown Kid is based on Punch, another 1960's Titans enemey.