Which duel role did you like better? When Fred Gwynne played Charlie, or when he played Johaan?

Fred Gwynne was very funny as Johann, and kind of scary, too. It's one of my favorite episodes.
Dr. Frankenstein: "Johann, how many times do I have to tell you, we are guests in this hotel. We do not eat the furniture. If you do not behave yourself, I will take out your brain and put it in backwards."