List of Star Trek: The Original Series episodes
Updated: 11/6/2025, 12:57:32 AM Wikipedia source
Created by Gene Roddenberry, the science fiction television series Star Trek (which eventually acquired the retronym Star Trek: The Original Series) stars William Shatner as Captain James T. Kirk, Leonard Nimoy as Mr. Spock, and DeForest Kelley as Dr. Leonard "Bones" McCoy aboard the fictional Federation starship USS Enterprise. The series originally aired from September 1966 through June 1969 on NBC. This is the first television series in the Star Trek franchise, and comprises 79 regular episodes over the series' three seasons, along with the series' original pilot episode, "The Cage". The episodes are listed in order by original air date, which match the episode order in each season's original, remastered, and Blu-ray DVD box sets. The original, single-disc DVD releases placed the episodes by production order, with "The Cage" on the final disc. After the series' cancellation, Paramount Television released Star Trek to television stations as a syndication package, where the series' popularity grew to become a "major phenomenon within popular culture". This popularity would eventually lead to the expansion of the Star Trek catalog, which as of 2020 includes nine more television series and thirteen Trek motion pictures. In 2006, CBS Paramount Domestic Television (now CBS Television Distribution) announced that each Original Series episode would be re-syndicated in high definition after undergoing digital remastering, including both new and enhanced visual effects. (To date, the remastered episodes have only been broadcast in standard definition, though all three seasons are now available on the high-definition Blu-ray Disc format.) The remastered episodes began with "Balance of Terror" (along with, in some markets, "Miri") during the weekend of September 16, 2006, and ended with "The Cage", which aired during the weekend of May 2, 2009. The remastered air dates listed below are based on the weekend each episode aired in syndication.
Tables
| Season | Episodes | Originally released | ||
| First released | Last released | |||
| 1 | 29 | September 8, 1966 (1966-09-08) | April 13, 1967 (1967-04-13) | |
| 2 | 26 | September 15, 1967 (1967-09-15) | March 29, 1968 (1968-03-29) | |
| 3 | 24 | September 20, 1968 (1968-09-20) | June 3, 1969 (1969-06-03) | |
| Title | Directed by | Written by | Original release date | Prod.code |
| "The Cage" | Robert Butler | Gene Roddenberry | October 4, 1988 (1988-10-04) | 01 |
| The crew of the Enterprise follow a distress signal to the planet Talos IV, where Captain Pike is taken captive by a group of telepathic aliens who create realistic illusions. The events of this pilot are revisited in the two-part Season 1 episode "The Menagerie". | ||||
| "Where No Man Has Gone Before" (pilot version) | James Goldstone | Samuel A. Peeples | - | 02a |
| After the Enterprise attempts to cross the Great Barrier at the edge of the galaxy, crew members Gary Mitchell and Elizabeth Dehner develop "godlike" psychic powers which threaten the safety of the crew and of humanity itself. Note: A re-edited version of the episode was aired as the third episode of the first season. | ||||
| No.overall | No. inseason | Title | Directed by | Written by | Original release date | Prod.code | households (in millions) |
| 1 | 1 | "The Man Trap" | Marc Daniels | George Clayton Johnson | September 8, 1966 (1966-09-08) | 06 | 11.36 |
| 2 | 2 | "Charlie X" | Lawrence Dobkin | Story by : Gene RoddenberryTeleplay by : D. C. Fontana | September 15, 1966 (1966-09-15) | 08 | 10.10 |
| 3 | 3 | "Where No Man Has Gone Before" | James Goldstone | Samuel A. Peeples | September 22, 1966 (1966-09-22) | 02b | 10.38 |
| 4 | 4 | "The Naked Time" | Marc Daniels | John D. F. Black | September 29, 1966 (1966-09-29) | 07 | 10.05 |
| 5 | 5 | "The Enemy Within" | Leo Penn | Richard Matheson | October 6, 1966 (1966-10-06) | 05 | 9.06 |
| 6 | 6 | "Mudd's Women" | Harvey Hart | Story by : Gene RoddenberryTeleplay by : Stephen Kandel | October 13, 1966 (1966-10-13) | 04 | 9.83 |
| 7 | 7 | "What Are Little Girls Made Of?" | James Goldstone | Robert Bloch | October 20, 1966 (1966-10-20) | 10 | 9.39 |
| 8 | 8 | "Miri" | Vincent McEveety | Adrian Spies | October 27, 1966 (1966-10-27) | 12 | 8.95 |
| 9 | 9 | "Dagger of the Mind" | Vincent McEveety | Shimon Wincelberg | November 3, 1966 (1966-11-03) | 11 | 9.94 |
| 10 | 10 | "The Corbomite Maneuver" | Joseph Sargent | Jerry Sohl | November 10, 1966 (1966-11-10) | 03 | 9.55 |
| 11 | 11 | "The Menagerie" | Marc Daniels | Gene Roddenberry | November 17, 1966 (1966-11-17) | 16 | 9.50 |
| 12 | 12 | Robert Butler | November 24, 1966 (1966-11-24) | 10.21 | |||
| 13 | 13 | "The Conscience of the King" | Gerd Oswald | Barry Trivers | December 8, 1966 (1966-12-08) | 13 | 8.62 |
| 14 | 14 | "Balance of Terror" | Vincent McEveety | Paul Schneider | December 15, 1966 (1966-12-15) | 09 | 8.51 |
| 15 | 15 | "Shore Leave" | Robert Sparr | Theodore Sturgeon | December 29, 1966 (1966-12-29) | 17 | 10.10 |
| 16 | 16 | "The Galileo Seven" | Robert Gist | Story by : Oliver CrawfordTeleplay by : Oliver Crawford and Shimon Wincelberg | January 5, 1967 (1967-01-05) | 14 | 8.89 |
| 17 | 17 | "The Squire of Gothos" | Don McDougall | Paul Schneider | January 12, 1967 (1967-01-12) | 18 | 10.82 |
| 18 | 18 | "Arena" | Joseph Pevney | Story by : Fredric BrownTeleplay by : Gene L. Coon | January 19, 1967 (1967-01-19) | 19 | 10.54 |
| 19 | 19 | "Tomorrow Is Yesterday" | Michael O'Herlihy | D. C. Fontana | January 26, 1967 (1967-01-26) | 21 | 10.98 |
| 20 | 20 | "Court Martial" | Marc Daniels | Story by : Don M. MankiewiczTeleplay by : Don M. Mankiewicz and Steven W. Carabatsos | February 2, 1967 (1967-02-02) | 15 | 10.05 |
| 21 | 21 | "The Return of the Archons" | Joseph Pevney | Story by : Gene RoddenberryTeleplay by : Boris Sobelman | February 9, 1967 (1967-02-09) | 22 | 10.93 |
| 22 | 22 | "Space Seed" | Marc Daniels | Story by : Carey WilberTeleplay by : Gene L. Coon and Carey Wilber | February 16, 1967 (1967-02-16) | 24 | 9.94 |
| 23 | 23 | "A Taste of Armageddon" | Joseph Pevney | Story by : Robert HamnerTeleplay by : Robert Hamner and Gene L. Coon | February 23, 1967 (1967-02-23) | 23 | 10.98 |
| 24 | 24 | "This Side of Paradise" | Ralph Senensky | Story by : Jerry Sohl and D. C. FontanaTeleplay by : D. C. Fontana | March 2, 1967 (1967-03-02) | 25 | 10.10 |
| 25 | 25 | "The Devil in the Dark" | Joseph Pevney | Gene L. Coon | March 9, 1967 (1967-03-09) | 26 | 10.38 |
| 26 | 26 | "Errand of Mercy" | John Newland | Gene L. Coon | March 23, 1967 (1967-03-23) | 27 | 9.50 |
| 27 | 27 | "The Alternative Factor" | Gerd Oswald | Don Ingalls | March 30, 1967 (1967-03-30) | 20 | 9.33 |
| 28 | 28 | "The City on the Edge of Forever" | Joseph Pevney | Harlan Ellison | April 6, 1967 (1967-04-06) | 28 | 9.39 |
| 29 | 29 | "Operation -- Annihilate!" | Herschel Daugherty | Steven W. Carabatsos | April 13, 1967 (1967-04-13) | 29 | 9.72 |
| No.overall | No. inseason | Title | Directed by | Written by | Original release date | Prod.code | households (in millions) |
| 30 | 1 | "Amok Time" | Joseph Pevney | Theodore Sturgeon | September 15, 1967 (1967-09-15) | 34 | 7.17 |
| 31 | 2 | "Who Mourns for Adonais?" | Marc Daniels | Gilbert Ralston | September 22, 1967 (1967-09-22) | 33 | 8.18 |
| 32 | 3 | "The Changeling" | Marc Daniels | John Meredyth Lucas | September 29, 1967 (1967-09-29) | 37 | 8.46 |
| 33 | 4 | "Mirror, Mirror" | Marc Daniels | Jerome Bixby | October 6, 1967 (1967-10-06) | 39 | 7.62 |
| 34 | 5 | "The Apple" | Joseph Pevney | Story by : Max EhrlichTeleplay by : Max Ehrlich and Gene L. Coon | October 13, 1967 (1967-10-13) | 38 | 7.90 |
| 35 | 6 | "The Doomsday Machine" | Marc Daniels | Norman Spinrad | October 20, 1967 (1967-10-20) | 35 | 7.73 |
| 36 | 7 | "Catspaw" | Joseph Pevney | Robert Bloch | October 27, 1967 (1967-10-27) | 30 | 8.85 |
| 37 | 8 | "I, Mudd" | Marc Daniels | Stephen Kandel | November 3, 1967 (1967-11-03) | 41 | 8.23 |
| 38 | 9 | "Metamorphosis" | Ralph Senensky | Gene L. Coon | November 10, 1967 (1967-11-10) | 31 | 7.11 |
| 39 | 10 | "Journey to Babel" | Joseph Pevney | D. C. Fontana | November 17, 1967 (1967-11-17) | 44 | 7.28 |
| 40 | 11 | "Friday's Child" | Joseph Pevney | D. C. Fontana | December 1, 1967 (1967-12-01) | 32 | 8.74 |
| 41 | 12 | "The Deadly Years" | Joseph Pevney | David P. Harmon | December 8, 1967 (1967-12-08) | 40 | 9.91 |
| 42 | 13 | "Obsession" | Ralph Senensky | Art Wallace | December 15, 1967 (1967-12-15) | 47 | 9.18 |
| 43 | 14 | "Wolf in the Fold" | Joseph Pevney | Robert Bloch | December 22, 1967 (1967-12-22) | 36 | N/A |
| 44 | 15 | "The Trouble with Tribbles" | Joseph Pevney | David Gerrold | December 29, 1967 (1967-12-29) | 42 | 8.85 |
| 45 | 16 | "The Gamesters of Triskelion" | Gene Nelson | Margaret Armen | January 5, 1968 (1968-01-05) | 46 | 10.92 |
| 46 | 17 | "A Piece of the Action" | James Komack | Story by : David P. HarmonTeleplay by : David P. Harmon and Gene L. Coon | January 12, 1968 (1968-01-12) | 49 | 9.97 |
| 47 | 18 | "The Immunity Syndrome" | Joseph Pevney | Robert Sabaroff | January 19, 1968 (1968-01-19) | 48 | 9.46 |
| 48 | 19 | "A Private Little War" | Marc Daniels | Story by : Don IngallsTeleplay by : Gene Roddenberry | February 2, 1968 (1968-02-02) | 45 | 9.52 |
| 49 | 20 | "Return to Tomorrow" | Ralph Senensky | John T. Dugan | February 9, 1968 (1968-02-09) | 51 | 10.14 |
| 50 | 21 | "Patterns of Force" | Vincent McEveety | John Meredyth Lucas | February 16, 1968 (1968-02-16) | 52 | 8.34 |
| 51 | 22 | "By Any Other Name" | Marc Daniels | Story by : Jerome BixbyTeleplay by : D. C. Fontana and Jerome Bixby | February 23, 1968 (1968-02-23) | 50 | 8.79 |
| 52 | 23 | "The Omega Glory" | Vincent McEveety | Gene Roddenberry | March 1, 1968 (1968-03-01) | 54 | 8.79 |
| 53 | 24 | "The Ultimate Computer" | John Meredyth Lucas | Story by : Laurence N. WolfeTeleplay by : D. C. Fontana | March 8, 1968 (1968-03-08) | 53 | 8.74 |
| 54 | 25 | "Bread and Circuses" | Ralph Senensky | Gene Roddenberry and Gene L. Coon | March 15, 1968 (1968-03-15) | 43 | 12.10 |
| 55 | 26 | "Assignment: Earth" | Marc Daniels | Story by : Gene Roddenberry and Art WallaceTeleplay by : Art Wallace | March 29, 1968 (1968-03-29) | 55 | 8.79 |
| No.overall | No. inseason | Title | Directed by | Written by | Original release date | Prod.code | households (in millions) |
| 56 | 1 | "Spock's Brain" | Marc Daniels | Gene L. Coon | September 20, 1968 (1968-09-20) | 61 | 9.18 |
| 57 | 2 | "The Enterprise Incident" | John Meredyth Lucas | D. C. Fontana | September 27, 1968 (1968-09-27) | 59 | 6.67 |
| 58 | 3 | "The Paradise Syndrome" | Jud Taylor | Margaret Armen | October 4, 1968 (1968-10-04) | 58 | 7.58 |
| 59 | 4 | "And the Children Shall Lead" | Marvin Chomsky | Edward J. Lakso | October 11, 1968 (1968-10-11) | 60 | 7.98 |
| 60 | 5 | "Is There in Truth No Beauty?" | Ralph Senensky | Jean Lisette Aroeste | October 18, 1968 (1968-10-18) | 62 | 7.35 |
| 61 | 6 | "Spectre of the Gun" | Vincent McEveety | Gene L. Coon | October 25, 1968 (1968-10-25) | 56 | 7.70 |
| 62 | 7 | "Day of the Dove" | Marvin Chomsky | Jerome Bixby | November 1, 1968 (1968-11-01) | 66 | 7.98 |
| 63 | 8 | "For the World Is Hollow and I Have Touched the Sky" | Tony Leader | Hendrik Vollaerts | November 8, 1968 (1968-11-08) | 65 | 7.52 |
| 64 | 9 | "The Tholian Web" | Herb Wallerstein | Judy Burns and Chet Richards | November 15, 1968 (1968-11-15) | 64 | 7.64 |
| 65 | 10 | "Plato's Stepchildren" | David Alexander | Meyer Dolinsky | November 22, 1968 (1968-11-22) | 67 | 7.41 |
| 66 | 11 | "Wink of an Eye" | Jud Taylor | Story by : Gene L. CoonTeleplay by : Arthur Heinemann | November 29, 1968 (1968-11-29) | 68 | 8.72 |
| 67 | 12 | "The Empath" | John Erman | Joyce Muskat | December 6, 1968 (1968-12-06) | 63 | 9.86 |
| 68 | 13 | "Elaan of Troyius" | John Meredyth Lucas | John Meredyth Lucas | December 20, 1968 (1968-12-20) | 57 | 7.81 |
| 69 | 14 | "Whom Gods Destroy" | Herb Wallerstein | Story by : Lee Erwin and Jerry SohlTeleplay by : Lee Erwin | January 3, 1969 (1969-01-03) | 71 | 6.84 |
| 70 | 15 | "Let That Be Your Last Battlefield" | Jud Taylor | Story by : Gene L. CoonTeleplay by : Oliver Crawford | January 10, 1969 (1969-01-10) | 70 | 7.92 |
| 71 | 16 | "The Mark of Gideon" | Jud Taylor | George F. Slavin and Stanley Adams | January 17, 1969 (1969-01-17) | 72 | 6.78 |
| 72 | 17 | "That Which Survives" | Herb Wallerstein | Story by : D. C. FontanaTeleplay by : John Meredyth Lucas | January 24, 1969 (1969-01-24) | 69 | 7.81 |
| 73 | 18 | "The Lights of Zetar" | Herb Kenwith | Jeremy Tarcher and Shari Lewis | January 31, 1969 (1969-01-31) | 73 | 8.09 |
| 74 | 19 | "Requiem for Methuselah" | Murray Golden | Jerome Bixby | February 14, 1969 (1969-02-14) | 76 | 6.95 |
| 75 | 20 | "The Way to Eden" | David Alexander | Story by : D. C. Fontana and Arthur HeinemannTeleplay by : Arthur Heinemann | February 21, 1969 (1969-02-21) | 75 | 7.07 |
| 76 | 21 | "The Cloud Minders" | Jud Taylor | Story by : David Gerrold and Oliver CrawfordTeleplay by : Margaret Armen | February 28, 1969 (1969-02-28) | 74 | 7.58 |
| 77 | 22 | "The Savage Curtain" | Herschel Daugherty | Story by : Gene RoddenberryTeleplay by : Gene Roddenberry and Arthur Heinemann | March 7, 1969 (1969-03-07) | 77 | 6.73 |
| 78 | 23 | "All Our Yesterdays" | Marvin Chomsky | Jean Lisette Aroeste | March 14, 1969 (1969-03-14) | 78 | 7.41 |
| 79 | 24 | "Turnabout Intruder" | Herb Wallerstein | Story by : Gene RoddenberryTeleplay by : Arthur Singer | June 3, 1969 (1969-06-03) | 79 | 5.02 |
| Pilots | |
| 01 | "The Cage" |
| 02a | "Where No Man Has Gone Before" |
| Season 1 | |
| 02b | "Where No Man Has Gone Before" |
| 03 | "The Corbomite Maneuver" |
| 04 | "Mudd's Women" |
| 05 | "The Enemy Within" |
| 06 | "The Man Trap" |
| 07 | "The Naked Time" |
| 08 | "Charlie X" |
| 09 | "Balance of Terror" |
| 10 | "What Are Little Girls Made Of?" |
| 11 | "Dagger of the Mind" |
| 12 | "Miri" |
| 13 | "The Conscience of the King" |
| 14 | "The Galileo Seven" |
| 15 | "Court Martial" |
| 16 | "The Menagerie, Parts I and II" |
| 17 | "Shore Leave" |
| 18 | "The Squire of Gothos" |
| 19 | "Arena" |
| 20 | "The Alternative Factor" |
| 21 | "Tomorrow Is Yesterday" |
| 22 | "The Return of the Archons" |
| 23 | "A Taste of Armageddon" |
| 24 | "Space Seed" |
| 25 | "This Side of Paradise" |
| 26 | "The Devil in the Dark" |
| 27 | "Errand of Mercy" |
| 28 | "The City on the Edge of Forever" |
| 29 | "Operation -- Annihilate!" |
| Season 2 | |
| 30 | "Catspaw" |
| 31 | "Metamorphosis" |
| 32 | "Friday's Child" |
| 33 | "Who Mourns for Adonais?" |
| 34 | "Amok Time" |
| 35 | "The Doomsday Machine" |
| 36 | "Wolf in the Fold" |
| 37 | "The Changeling" |
| 38 | "The Apple" |
| 39 | "Mirror, Mirror" |
| 40 | "The Deadly Years" |
| 41 | "I, Mudd" |
| 42 | "The Trouble with Tribbles" |
| 43 | "Bread and Circuses" |
| 44 | "Journey to Babel" |
| 45 | "A Private Little War" |
| 46 | "The Gamesters of Triskelion" |
| 47 | "Obsession" |
| 48 | "The Immunity Syndrome" |
| 49 | "A Piece of the Action" |
| 50 | "By Any Other Name" |
| 51 | "Return to Tomorrow" |
| 52 | "Patterns of Force" |
| 53 | "The Ultimate Computer" |
| 54 | "The Omega Glory" |
| 55 | "Assignment: Earth" |
| Season 3 | |
| 56 | "Spectre of the Gun" |
| 57 | "Elaan of Troyius" |
| 58 | "The Paradise Syndrome" |
| 59 | "The Enterprise Incident" |
| 60 | "And the Children Shall Lead" |
| 61 | "Spock's Brain" |
| 62 | "Is There in Truth No Beauty?" |
| 63 | "The Empath" |
| 64 | "The Tholian Web" |
| 65 | "For the World Is Hollow and I Have Touched the Sky" |
| 66 | "Day of the Dove" |
| 67 | "Plato's Stepchildren" |
| 68 | "Wink of an Eye" |
| 69 | "That Which Survives" |
| 70 | "Let That Be Your Last Battlefield" |
| 71 | "Whom Gods Destroy" |
| 72 | "The Mark of Gideon" |
| 73 | "The Lights of Zetar" |
| 74 | "The Cloud Minders" |
| 75 | "The Way to Eden" |
| 76 | "Requiem for Methuselah" |
| 77 | "The Savage Curtain" |
| 78 | "All Our Yesterdays" |
| 79 | "Turnabout Intruder" |
References
- Credited as S. Bar-David
- Credited as Nathan Butler
- Credited as Jud Crucis
- Credited as John Kingsbridge
- Credited as Lee Cronin
- Credited as Michael Richards
- The Star Trek Encyclopedia (3rd ed.)
- Star Trek Concordance
- "Star Trek: Season 1 DVD Information"https://web.archive.org/web/20090509180035/http://www.tvshowsondvd.com/releases/Star-Trek-Season-1/3771
- "Star Trek: Season 2 DVD Information"https://web.archive.org/web/20090714015814/http://www.tvshowsondvd.com/releases/Star-Trek-Season-2/3820
- "Star Trek: Season 3 DVD Information"https://web.archive.org/web/20090714020447/http://www.tvshowsondvd.com/releases/Star-Trek-Season-3/3821
- "Star Trek: Season 1 (Remastered) DVD Information"https://web.archive.org/web/20090308150516/http://tvshowsondvd.com/releases/Star-Trek-Season-1-Remastered-HD-DVD/6973
- "Star Trek: Season 2 (Remastered) DVD Information"https://web.archive.org/web/20090714015458/http://www.tvshowsondvd.com/releases/Star-Trek-Season-2-Remastered/7736
- "Star Trek: Season 3 (Remastered) DVD Information"https://web.archive.org/web/20090714020421/http://www.tvshowsondvd.com/releases/Star-Trek-Season-3-Remastered/8147
- "CBS & Paramount Announce First Star Trek Blu-ray sets - TOS S1 & All TOS movies coming April/May"http://trekmovie.com/2009/02/16/cbs-paramount-announce-first-star-trek-blu-ray-sets-tos-s1-all-tos-movies-coming-aprilmay/
- "Star Trek on DVD, Release Info, Reviews, News at TVShowsOnDVD.com"https://web.archive.org/web/20090501071222/http://www.tvshowsondvd.com/shows/Star-Trek/3971
- "Star Trek Syndication Advertisements, Circa 1969-1970"http://www.tvobscurities.com/2008/12/star-trek-syndication-advertisements-circa-1969-1970/
- "Star Trek (U.S. Science Fiction)"https://web.archive.org/web/20180411184904/http://www.museum.tv/eotv/startrek.htm
- "It's Official: Classic Trek Coming to HDTV With New CGI"http://trekmovie.com/2006/08/30/its-official-classic-trek-coming-to-hdtv-with-new-cgi-effectswe-called-it/
- "TOS Remastered: Format"http://trekmovie.com/tos-in-hd/
- "Star Trek: The Original Series - Season 1 Blu-ray"http://www.blu-ray.com/movies/movies.php?id=4189
- "TOS Remastered Episode Guide - Season 1"http://trekmovie.com/tos-in-hd/hdtv-star-trek-tos-episode-order/
- "First Look: Preview for Star Trek Remastered "The Cage" Airing Next Weekend"http://trekmovie.com/2009/04/22/preview-for-star-trek-remastered-the-cage-airing-next-weekend/
- David Alexander, Star Trek Creator: The Authorized Biography of Gene Roddenberry, p. 218.
- Up Till Now: The Autobiographyhttps://archive.org/details/uptillnowautobio00shat/page/119
- David Alexander, Star Trek Creator: The Authorized Biography of Gene Roddenberry, p. 244.
- Star Trek Creator: The Authorized Biography of Gene Roddenberryhttps://archive.org/details/startrekcreator00davi
- The Making of Star Trekhttps://archive.org/details/makingofstartrek00whit
- "A Look Back at The History of Star Trek's First Pilot "The Cage""https://web.archive.org/web/20110717102259/http://www.trekweb.com/articles/2008/11/12/A-Look-Back-at-The-History-of-Star-Trek-First-Pilot-The-Cage.shtml
- "Volume 40: Turnabout Intruder/The Cage"https://web.archive.org/web/20041216060709/http://www.tvshowsondvd.com/releaseinfo.cfm?ReleaseID=470
- Both the original Season 3 and "remastered" season 3 sets list the original air date for "The Cage" as October 15, 1988.
- DVD News Archived September 24, 2009, at the Wayback Machinehttps://tvshowsondvd.com/news/Star-Trek-Season-3-Bluray/12702
- "Star Trek: Episodes season 1"https://web.archive.org/web/20090621234357/http://www.startrek.com/startrek/view/series/TOS/episodes/index.html?season=1
- I Am Spockhttps://archive.org/details/iamspock00nimo/page/38
- Inside Star Trek: The Real Storyhttps://archive.org/details/isbn_9780671896287
- The Longest Trek: My Tour of the Galaxy
- Entertainment Weekly Special Edition January 18, 1995
- "1968 Hugo Awards"http://www.thehugoawards.org/?page_id=51
- Star Trek Concordance
- Nielsen Media Researchhttps://drive.google.com/file/d/1hDRfsUrtnYPmQv3ZwnXwCElP_7fIEc_e/view
- Nielsen Media Researchhttps://drive.google.com/file/d/19-ARGn6DUoXO6davlGVbThCRuyrEEbrP/view
- I Am Spockhttps://archive.org/details/iamspock00nimo/page/112
- Up Till Now: The Autobiographyhttps://archive.org/details/uptillnowautobio00shat/page/131
- David Gerrold, quoting Bjo Trimble, in The World of Star Trek, Ballantine Books, 1973, p. 166
- World Radio Historyhttps://www.worldradiohistory.com/Archive-BC/BC-1968/1968-03-04-BC.pdf
- William Shatner, Star Trek Memories, Harper Torch, 1994 paperback, p. 257
- Nichols, Beyond Uhura, p. 189
- Nielsen Media Researchhttps://drive.google.com/file/d/1JiB4lPmsFcmM8aVda8nLv-aEJ1D7bMYM/view
- "StarTrek.com: DVD"https://web.archive.org/web/20100113205300/http://www.startrek.com/startrek/view/series/TOS/dvd/index.html
- genome.ch.bbc.co.ukhttps://web.archive.org/web/20230311090323/https://genome.ch.bbc.co.uk/search/0/20?order=first&q=%22Star+Trek%22
- The Encyclopedia of TV Science Fictionhttps://archive.org/details/encyclopediaoftv0000fult/page/429