Aired on CBS from 1960-1962, this series starred Anthony George and Doug McClure as Don Corey and Jed Sills, two detectives at the San Francisco-based Checkmate, Inc., a private investigation firm. Joining the duo to protect their clients from danger was Sebastian Cabot as ex-Oxford criminology professor Carl Hyatt. All 70 episodes of the series are featured in a seven-disc set. 58 1/3 hrs. total. Standard; Soundtrack: English. 70 episodes on 7 discs. 58 1/3 hrs.