First Season |
| 1. | September 8, 1966 | The Man Trap |
| 2. | September 15, 1966 | Charlie X |
| 3. | September 22, 1966 | Where No Man Has Gone Before |
| 4. | September 29, 1966 | The Naked Time |
| 5. | October 6, 1966 | The Enemy Within |
| 6. | October 13, 1966 | Mudd'S Women |
| 7. | October 20, 1966 | What Are Little Girls Made Of? |
| 8. | October 27, 1966 | Miri |
| 9. | November 3, 1966 | Dagger Of The Mind |
| 10. | November 10, 1966 | The Corbomite Maneuver |
| 11. | November 17, 1966 | The Menagerie (Part I) |
| 12. | November 24, 1966 | The Menagerie (Part Ii) |
| 13. | December 8, 1966 | The Conscience Of The King |
| 14. | December 15, 1966 | Balance Of Terror |
| 15. | December 29, 1966 | Shore Leave |
| 16. | January 5, 1967 | Galileo Seven |
| 17. | January 12, 1967 | The Squire Of Gothos |
| 18. | January 19, 1967 | Arena |
| 19. | January 26, 1967 | Tomorrow Is Yesterday |
| 20. | February 2, 1967 | Court-Martial |
| 21. | February 9, 1967 | Return Of The Archons |
| 22. | February 16, 1967 | Space Seed |
| 23. | February 23, 1967 | A Taste Of Armageddon |
| 24. | March 2, 1967 | This Side Of Paradise |
| 25. | March 9, 1967 | The Devil In The Dark |
| 26. | March 23, 1967 | Errand Of Mercy |
| 27. | March 30, 1967 | The Alternative Factor |
| 28. | April 6, 1967 | The City On The Edge Of Forever |
| 29. | April 13, 1967 | Operation--Annihilate! |
Second Season |
| 30. | September 15, 1967 | Amok Time |
| 31. | September 22, 1967 | Who Mourns For Adonais |
| 32. | September 29, 1967 | The Changeling |
| 33. | October 6, 1967 | Mirror, Mirror |
| 34. | October 13, 1967 | The Apple |
| 35. | October 20, 1967 | The Doomsday Machine |
| 36. | October 27, 1967 | Catspaw |
| 37. | November 3, 1967 | I, Mudd |
| 38. | November 10, 1967 | Metamorphosis |
| 39. | November 17, 1967 | Journey To Babel |
| 40. | December 8, 1967 | The Deadly Years |
| 41. | December 15, 1967 | Obsession |
| 42. | December 22, 1967 | Wolf In The Fold |
| 43. | December 29, 1967 | The Trouble With Tribbles |
| 44. | January 5, 1968 | The Gamesters Of Triskelion |
| 45. | January 12, 1968 | A Piece Of The Action |
| 46. | January 19, 1968 | The Immunity Syndrome |
| 47. | February 2, 1968 | A Private Little War |
| 48. | February 9, 1968 | Return To Tomorrow |
| 49. | February 16, 1968 | Patterns Of Force |
| 50. | February 23, 1968 | By Any Other Name |
| 51. | March 1, 1968 | The Omega Glory |
| 52. | March 8, 1968 | The Ultimate Computer |
| 53. | March 15, 1968 | Bread And Circuses |
| 54. | March 22, 1968 | Friday'S Child |
| 55. | March 29, 1968 | Assignment: Earth |
Third Season |
| 56. | September 20, 1968 | Spock'S Brain |
| 57. | September 27, 1968 | The Enterprise Incident |
| 58. | October 4, 1968 | The Paradise Syndrome |
| 59. | October 11, 1968 | And The Children Shall Lead |
| 60. | October 18, 1968 | Is There In Truth No Beauty? |
| 61. | October 25, 1968 | Spectre Of The Gun |
| 62. | November 1, 1968 | Day Of The Dove |
| 63. | November 8, 1968 | For The World Is Hollow, And I Have Touched The Sky |
| 64. | November 15, 1968 | The Tholian Web |
| 65. | November 22, 1968 | Plato'S Stepchildren |
| 66. | November 29, 1968 | Wink Of An Eye |
| 67. | December 6, 1968 | The Empath |
| 68. | December 20, 1968 | Elaan Of Troyius |
| 69. | January 3, 1969 | Whom Gods Destroy |
| 70. | January 10, 1969 | Let That Be Your Last Battlefield |
| 71. | January 17, 1969 | The Mark Of Gideon |
| 72. | January 24, 1969 | That Which Survives |
| 73. | January 31, 1969 | The Lights Of Zetar |
| 74. | February 14, 1969 | Requiem For Methuselah |
| 75. | February 21, 1969 | The Way To Eden |
| 76. | February 28, 1969 | The Cloud Minders |
| 77. | March 7, 1969 | The Savage Curtain |
| 78. | March 14, 1969 | All Our Yesterdays |
| 79. | March 28, 1969 | Turnabout Intruder (Possibly June 3, 1969) |