This was a very entertaining episode, one of the better ones. Not only does someone - "Dr. Hugo Strange" - discover that Bruce Wayne is really Batman, but three famous villains all enter the story: The Joker, Two-Face and The Penguin. Wow, no wonder this was so entertaining.
The story revolves around Dr. Strange and his invention, which is supposed to help stressed- out people. Executives and others go to his spa and the bad doctor extracts their childhood memories from them and then blackmails them over something they did as a kid. It starts with a prominent judge and then happens to Bruce Wayne, resulting in the evil doctor discovering Wayne is also Batman. He, then, offers this information to the highest bidder among those famous villains.
How does Batman stop his identity from being revealed? How does Robin enter the picture here? What happens to all these crooks? Well, you'll have to watch as I won't spoil it. Suffice to say this is a great episode. Ones with the Joker's wise-guy comments usually are top-notch.