It's always a delight for me seeing Frank Gorshin as the Riddler and Burgess Meredith as Penguin - whether it be in photos or in clips on YouTube. I greatly miss being able to watch this show properly.
Oh, and I had forgotten about Vincent Price appearing! Such wonderful actors! And of course Bruce Lee via the Green Hornet/Kato scene up there.
THAT is an excellent Riddler.
He looks so slick in that suit, and I am 100% confident he could have pulled off a more serious, less camp version of the character provided the opportunity.
More to support that notion:
He looks so iconically Riddler in that last one. Feels very BTAS in a way to me, but perhaps more contemplative, and of course real. He's got a lot of gravity to him.