One can tell the timeless longevity of a television series by the condition if it's still playing on TV. "Perry Mason" (1957-1966) is! It followed a tried-and-true formula: the first half-hour the situation is developed, then there's a murder. The second half-hour is filled with courtroom dramatics, to find the killer. But this is considerably heightened by a moody musical score, shadowy, gripping B&W photography, incisive scripts, magnificent guest stars (many who appeared multiple times), and lastly the brilliant ensemble cast headed by Raymond Burr, with Barbara Hale, William Hopper, William Talman and others. The series was re-done (poorly) in 1973, the more recent 2 hour TV movies were padded and don't hold up to repeated viewings. Voted the top dramatic series by TV Guide, it just does not get any better. Case closed.
Review of Perry Mason
