Given the time frame of the original series, I wonder what actors could have portrayed the following Bat-Villains- feel free to add to the list:

This list includes "modern" villains (1980s forward) as well as anyone else who was not used on the TV show.

Ra's Al Ghul
Talia
Bane
Two Face
Anarky
Cluemaster
Sportsmaster
Lockup
Man-Bat
Maxie Zeus
Carmine Falcone
Rupert Thorne
Court of Owls
Hugo Strange
Poison Ivy
Blockbuster
Azrael
Killer Croc

also, feel free to speculate on how the actual portrayals of the characters of the show might go, given the overall camp-style tone of the series.