Eli Wallach, one of the three actors to play Mr. Freeze, is still kicking at the age of 97. I think it's just the two of them. A number of "special guest villainesses" have left us as well: One Catwoman, Ma Parker, Black Widow (died soon after the show), Marsha Queen of Diamonds, Lola Lasange, Dr. Cassandra, Zelda the Great/Olga the Queen of Cossacks. (Falseface's right-hand woman Blaze passed several years ago too) The other two Catwomen, the Siren, Nora Clavicle, Lady Peasoup, and Minerva are still with us. (I always thought the then-new villainess Poison Ivy would be a great role on the show for some redhead like Ann-Margaret).