Description: Checkmate Inc. was a San Franciso firm who mission was to stop or "checkmate" a crime before it happened. Anthony George played Don Corey, the head of the firm, and Doug McClure (in his second series) played Jed Sills, Corey's assistant. Sebastian Cabot played a university criminology professor who served as a consultant to Checkmate. The three worked out of Corey's beautiful Nob Hill apartment which had a great view of the city. Guest stars were always top of the line and included Lee Marvin, Claire Bloom, Terry Moore, Angie Dickinson, Susan Oliver, James Coburn, Peter Lorre, Charles Laughton, David Janssen, Jack Lord, Lloyd Bridges, Robert Lansing, Jeffrey Hunter, Dorothy Malone, Elizabeth Montgomery, and Inger Stevens. Originally sexy Joan O'Brien was to play the Doug McClure detective role, which would have been very intriguing in 1960. The best thing about the show were the three appealing leads and that great apartment. In the second season, when Checkmate Inc. moved to a posh office suite, it just wasn't the same. This show was originally on CBS Saturday nights at 8:30, immediately following "Perry Mason".