Don Corey and Jed Sills operate Checkmate, Inc., a very high priced detective agency in San Francisco. Helping them protect the lives of their clients is British criminologist (once an Oxford professor) Carl Hyatt.
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | 0 | ||
| Season 1 | September 1960 | June 1961 | 36 |
| Season 2 | October 1961 | June 1962 | 34 |
| Unassigned Episodes | 0 |
| Season | From | To | Episodes |
|---|---|---|---|
| Unassigned Episodes | 70 |
| Season | From | To | Episodes |
|---|---|---|---|
| Season 1 | 0 | ||
| Unassigned Episodes | 70 |
| Name | Number of Episodes | Dates | |
|---|---|---|---|
| Don Taylor | 8 | 02/25/1961 - 05/16/1962 | |
| Paul Stewart | 6 | 04/08/1961 - 02/14/1962 | |
| Don Weis | 6 | 10/01/1960 - 06/10/1961 | |
| Herschel Daugherty | 5 | 09/24/1960 - 05/13/1961 | |
| Robert Ellis Miller | 5 | 11/01/1961 - 06/20/1962 | |
| Ron Winston | 4 | 10/18/1961 - 05/23/1962 | |
| William A. Graham | 4 | 01/10/1962 - 05/09/1962 | |
| John English | 3 | 01/21/1961 - 03/18/1961 | |
| Jules Bricken | 3 | 09/17/1960 - 05/06/1961 | |
| Tom Gries | 3 | 11/08/1961 - 03/07/1962 | |
| James Wong Howe | 2 | 06/24/1961 - 11/15/1961 | |
| Alexander Singer | 2 | 01/31/1962 - 03/28/1962 | |
| Douglas Heyes | 2 | 12/17/1960 | |
| Ted Post | 2 | 12/03/1960 - 04/01/1961 | |
| Alan Crosland Jr. | 2 | 11/22/1961 - 12/13/1961 | |
| Frank Arrigo | 2 | 10/15/1960 - 11/05/1960 | |
| John Newland | 1 | 05/20/1961 | |
| Don Medford | 1 | 10/29/1960 | |
| Byron Paul | 1 | 04/04/1962 | |
| Walter Doniger | 1 | 11/26/1960 | |
| Sidney Lanfield | 1 | 01/28/1961 | |
| Ralph Senensky | 1 | 06/06/1962 | |
| Bernard Girard | 1 | 04/11/1962 | |
| Allen H. Miner | 1 | 04/15/1961 | |
| Elliot Silverstein | 1 | 10/04/1961 | |
| Herman Hoffman | 1 | 02/07/1962 | |
| Richard Irving | 1 | 02/18/1961 | |
| Robert Florey | 1 | 10/22/1960 | |
| Earl Bellamy | 1 | 06/17/1961 | |
| Lewis Allen | 1 | 04/25/1962 |
| Name | Number of Episodes | Dates | |
|---|---|---|---|
| Mark Rodgers | 7 | 01/17/1962 - 05/23/1962 | |
| Harold Clements | 6 | 10/22/1960 - 05/06/1961 | |
| Robert C. Dennis | 6 | 01/28/1961 - 06/24/1961 | |
| James Gunn | 6 | 09/17/1960 - 06/17/1961 | |
| Richard De Roy | 5 | 11/01/1961 - 05/02/1962 | |
| Sy Salkowitz | 3 | 02/21/1962 - 04/18/1962 | |
| Lewis Reed | 3 | 10/11/1961 - 01/03/1962 | |
| Stuart Jerome | 3 | 02/25/1961 - 05/27/1961 | |
| Dick Nelson (I) | 3 | 10/29/1960 - 05/16/1962 | |
| Robert Libott | 3 | 11/05/1960 - 04/22/1961 | |
| Anthony Spinner | 2 | 11/08/1961 - 02/21/1962 | |
| Mann Rubin | 2 | 10/18/1961 - 01/24/1962 | |
| Sheldon Stark | 2 | 04/15/1961 - 05/20/1961 | |
| Edmund Morris | 2 | 02/18/1961 - 05/06/1961 | |
| Jonathan Latimer | 2 | 11/05/1960 - 02/14/1962 | |
| Berne Giler | 2 | 02/04/1961 - 04/01/1961 | |
| Peter Mamakos | 2 | 01/14/1961 | |
| Robert J. Shaw | 2 | 01/31/1962 - 06/06/1962 | |
| Richard Fielder | 2 | 10/04/1961 - 06/20/1962 | |
| Howard Browne | 1 | 10/15/1960 | |
| Ken Pettus | 1 | 04/15/1961 | |
| William McGivern | 1 | 11/12/1960 | |
| William Shatner | 1 | 10/11/1961 | |
| Steve Fisher | 1 | 10/29/1960 | |
| Michael Morris | 1 | 09/24/1960 | |
| Betty Ulius | 1 | 12/31/1960 | |
| John McGreevey | 1 | 12/27/1961 | |
| Sonya Roberts | 1 | 10/18/1961 | |
| Jameson Brewer | 1 | 11/26/1960 | |
| Raphael Hayes | 1 | 03/04/1961 | |
| John Falvo | 1 | 01/14/1961 | |
| Oliver Gard | 1 | 01/17/1962 | |
| Stirling Silliphant | 1 | 10/01/1960 | |
| Wanda Duncan | 1 | 05/20/1961 | |
| Alfred Brenner | 1 | 11/15/1961 | |
| Robert Blees | 1 | 03/11/1961 | |
| Robert Bloomfield | 1 | 11/19/1960 | |
| Joel Murcott | 1 | 10/15/1960 | |
| Curtis Kenyon | 1 | 03/18/1961 | |
| Rik Vollaerts | 1 | 04/08/1961 | |
| Laurence Heath | 1 | 02/18/1961 | |
| Dorothy Hechtlinger | 1 | 12/13/1961 | |
| William Templeton | 1 | 06/24/1961 | |
| Max Ehrlich | 1 | 02/07/1962 | |
| Richard Berg | 1 | 06/10/1961 | |
| Bob Duncan | 1 | 05/20/1961 | |
| Harold Jack Bloom | 1 | 04/04/1962 | |
| Leonard Heideman | 1 | 11/26/1960 | |
| Gwen Bagni | 1 | 03/11/1961 | |
| James Lee Barrett | 1 | 06/10/1961 | |
| John Kneubuhl | 1 | 09/17/1960 | |
| Halsey Melone | 1 | 12/31/1960 | |
| Warner Law | 1 | 12/03/1960 | |
| Finlay McDermid | 1 | 06/24/1961 | |
| Juarez Roberts | 1 | 10/25/1961 | |
| Oliver Crawford | 1 | 03/14/1962 | |
| Leigh Brackett | 1 | 10/22/1960 | |
| Helen Nielsen | 1 | 01/21/1961 | |
| William Lindsay Gresham | 1 | 01/28/1961 | |
| John Mantley | 1 | 04/25/1962 | |
| Richard McCracken | 1 | 03/21/1962 | |
| Edwin Blum | 1 | 05/13/1961 | |
| Larry Cohen | 1 | 12/13/1961 | |
| Eric Ambler | 1 | 10/04/1961 | |
| Reuben Bercovitch | 1 | 05/16/1962 |
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