A radio spot series that began in 1949 and became a tv series in 1952. Granted the show only ran for 39 episodes it had left a mark as one full of intrigue and interesting cases.
I'm happy I discovered "Dangerous Assignment" through my endless cross reference searches on the web using Google, Wikipedia, Youtube and of course IMDb.com.
This well-done espionage thriller from the early days of the Cold War has one of the best openings of any TV series. US agent Steve Mitchell (Brian Donlevy) wearing a top hat and smoking a cigarette ambles down a foggy desolate waterfront back street (a ship whistle is blowing in the background).
This is the best show I never heard of. I watched one show on a compilation DVD, and then went looking for more.