What was the name and the intro tag line for the 50's TV series, The Shadow?
Your question is most perplexing. I recall a cloaked figure, wearing a hat, some fog, but alas, I checked and double checked, the was never a TV series called "The Shadow" in the 50's or any other time. Is it possible you are remember a show from radio? Each episode started with the line "Who knows what evil lurks in the heart of man? The Shadow knows [sinister laugh]." I don't know where I'm getting this mental image of the Shadow, but I did an extensive check, and found no series on TV.
If you come up with any other information, let me know.