I loved this series, and I do not like television series in general. The cast was perfect: Corey as tough, worldly-wise chief of "Checkmate" and mentor to partner Doug McClure, who here was able to get away from the grinning, pretty-boy roles that would dog his career, playing the younger detective with (for him) a subdued grittiness. And then there was Sebastian Cabot--vested suits, walking stick, sparkling eyes, he stole every scene he was in. The writing was excellent, and yes, the opening was way ahead of its time. An all-around classy show with terrific guest stars...naturally it is not available on VHS or DVD. Another reason that even at that age I was in agreement with Newton Minnow's description of television programming as a "vast wasteland." And the waste is the stuff that makes it to TVland and DVD. Which would be fine if shows like "Checkmate" were not lost forever.