Season 1 1. 1- 1 9608 1 Jul 57 The Mickey Farmer Case
2. 1- 2 9616 8 Jul 57 Custody
3. 1- 3 9614 15 Jul 57 Escape from Oak Lane
4. 1- 4 9618 22 Jul 57 The Homicide Habit
5. 1- 5 9620 29 Jul 57 Picture of Fear
6. 1- 6 9622 5 Aug 57 Hit and Run
7. 1- 7 9624 12 Aug 57 The Big Score
8. 1- 8 9626 19 Aug 57 The Chess Player
9. 1- 9 9602 26 Aug 57 The Torch Carriers
10. 1-10 9600 9 Sep 57 The Pete Rocco Case
11. 1-11 9628 16 Sep 57 Venus of Park Avenue
12. 1-12 9604 23 Sep 57 The Merry-Go-Round Case
Season 2 13. 2- 1 8600 2 Jan 58 The Space Society
14. 2- 2 8602 9 Jan 58 The Dark Horse
15. 2- 3 8604 16 Jan 58 The Payoff
16. 2- 4 8606 23 Jan 58 Double Jeopardy
17. 2- 5 8608 30 Jan 58 Arson
18. 2- 6 8610 6 Feb 58 The Ed Church Case
19. 2- 7 8612 13 Feb 58 Chinese Honeymoon
20. 2- 8 8614 20 Feb 58 Rodeo
21. 2- 9 8616 27 Feb 58 A Cup of Black Coffee
22. 2-10 8618 6 Mar 58 The George Dale Case
23. 2-11 8620 13 Mar 58 Juvenile Jacket
24. 2-12 8622 27 Mar 58 Pension Plan
25. 2-13 8624 10 Apr 58 Short Haul
26. 2-14 8626 17 Apr 58 Another Man's Poison
27. 2-15 8628 24 Apr 58 The Purple Penguin
28. 2-16 8630 1 May 58 Lost Testament
29. 2-17 8632 8 May 58 The Percentage Takers
30. 2-18 8634 22 May 58 Widow's Walk
31. 2-19 8638 29 May 58 The Bungalow Murder
32. 2-20 8640 12 Jun 58 One Foot in the Grave
33. 2-21 8636 26 Jun 58 Snow Queen
Season 3 34. 3- 1 6801 15 Feb 59 The Sport
35. 3- 2 6803 22 Feb 59 Pack Rat
36. 3- 3 6807 1 Mar 59 Body of the Crime
37. 3- 4 6805 8 Mar 59 Soft Touch
38. 3- 5 6809 15 Mar 59 Boomerang Bait
39. 3- 6 6817 22 Mar 59 Matador Murder
40. 3- 7 6813 29 Mar 59 Murder at the Mansion
41. 3- 8 6815 5 Apr 59 Marineland Mystery
42. 3- 9 6821 12 Apr 59 Charity Affair
43. 3-10 6819 19 Apr 59 Two for Paradise
44. 3-11 6811 3 May 59 Crown of Silla
45. 3-12 6823 10 May 59 Jukebox
46. 3-13 6827 17 May 59 Echo of Laughter
47. 3-14 6829 24 May 59 The Limping Man
48. 3-15 6831 31 May 59 The Hide-Out
49. 3-16 6833 7 Jun 59 Rough Cut
50. 3-17 6835 14 Jun 59 Family Affair
51. 3-18 6837 21 Jun 59 Design for Murder
Season 4 52. 4- 1 3202 5 Oct 59 The Hoodlum
53. 4- 2 3204 12 Oct 59 Act of Grace
54. 4- 3 3206 19 Oct 59 The Bookie
55. 4- 4 3208 26 Oct 59 The Client
56. 4- 5 3214 2 Nov 59 The Runaway
57. 4- 6 3210 9 Nov 59 No Laughing Matter
58. 4- 7 3212 16 Nov 59 The Messenger
59. 4- 8 3218 23 Nov 59 The Counselor
60. 4- 9 3216 30 Nov 59 The Image
61. 4-10 3220 7 Dec 59 The Adjustor
62. 4-11 3222 14 Dec 59 Marked for Murder
63. 4-12 3224 21 Dec 59 The Caller
64. 4-13 3226 28 Dec 59 One Dead Cat
65. 4-14 3228 11 Jan 60 Dead to the World
66. 4-15 3232 18 Jan 60 Seven Swords
67. 4-16 3234 25 Jan 60 The Fine Art of Murder
68. 4-17 3230 28 Jun 60 The Popskull
69. 4-18 3244 5 Jul 60 And Whose Little Baby Are You?
70. 4-19 3250 19 Jul 60 Fallen Star
71. 4-20 3248 2 Aug 60 Coat of Arms
72. 4-21 3236 9 Aug 60 Double Trouble
73. 4-22 3238 16 Aug 60 The Lovely Fraud
74. 4-23 3252 23 Aug 60 Accent on Murder
75. 4-24 3242 30 Aug 60 East of Danger
76. 4-25 3240 6 Sep 60 Running Scared
77. 4-26 3246 The Mouse
David Janssen as Richard Diamond
Regis Toomey as Lt. Dennis "Mac" McGough [ 1-2 ]
Russ Conway as Lt. Pete Kile [ 3-4 ]
Barbara Bain as Karen Wells [ 3 ]
Mary Tyler Moore as Sam [ 3 ]
Roxanne Brooks as Sam [ 3-4 ]
recurring characters:
Bill Erwin as Sgt. Riker [ 1 ]
Hillary Brooke as Laura Renault [ 3-4 ]
Richard Devon as Sgt. Alden [ 3-4 ]