The 59th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Melvin Belli guest stars; future Space Academy cast members Pamelyn Ferdin and Brian Tochi both appear as children in this episode. 
The 59th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Melvin Belli guest stars; future Space Academy cast members Pamelyn Ferdin and Brian Tochi both appear as children in this episode.
The 60th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Diana Muldaur guest stars, her second guest shot on the series; she will later appear as a regular in the second season of Star Trek: The Next Generation.
The 61st episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Ron Soble and Rex Holman guest star.
The 62nd episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Michael Ansara guest stars as Kang.
The 63rd episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Kate Woodville and Byron Morrow guest star.
The 64th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. This marks the first appearance of the Tholians and, though they will be mentioned frequently in later Star Trek spinoffs, the last appearance until the 21st century spinoff series Star Trek: Enterprise.
The 65th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. This episode features one of the earliest interracial kisses in the history of American scripted television; a handful of NBC affiliates in the southern United States pre-empt the episode as a result. 
The 66th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Kathie Browne and Jason Evers (Wrangler, Robot Monster) guest star.
The 67th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Kathryn Hays guest stars in a role without any dialogue at all.
The 68th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. France Nuyen guest stars.
The 69th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Steve Inhat and Yvonne Craig (Batman) guest star.
The 70th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Frank Gorshin (Batman) guest stars.
The 71st episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Sharon Acker and Gene Dynarski guest star.
The 72nd episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Lee Meriwether (Batman) guest stars.
The 73rd episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. This episode is co-written by Shari Lewis, better known as the puppeteer behind Lambchop.
The 74th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. This episode sees Spock use a version of a Vulcan mind-meld on Kirk, urging him to “forget”; the later movies will reveal that this memory manipulation technique has an opposite number: “remember”…
The 75th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. This infamously “hippie themed” episode guest stars Charles Napier.
The 76th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Jeff Corey guest stars.
The 77th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Lee Bergere and Barry Atwater guest star. This episode features the last Klingon seen in the original television series.
The 78th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. Ian Wolfe and Mariette Hartley guest star. The last episode of Star Trek, originally scheduled for the following week, is pre-empted and aired months later with little fanfare.
The 79th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. This was the final episode produced or broadcast; Gene Roddenberry, having caught the meaning of the series’ move to a Friday night “death slot,” had already moved on to greener pastures without making arrangements for another fan protest for Star Trek’s renewal.
After years of denying that Star Trek had ever been a “kids show” like its prime-time rival Lost In Space, Gene Roddenberry agrees to NBC’s offer to restart the science fiction cult classic as an animated series, premiering on the seventh anniversary of the live-action show’s debut with the episode Beyond The Farthest Star. In the end, this series becomes the only iteration of the Star Trek franchise to win an Emmy Award for a non-technical (i.e. music, hairstyling, special effects) category.
The second episode of the animated Star Trek series premieres on NBC, written by original series script editor D.C. Fontana, with Mark Lenard reprising the role of Sarek.
The fourth episode of the animated Star Trek series premieres on NBC, with a script by original series writer Margaret Armen.
The seventh episode of the animated Star Trek series premieres on NBC, written by original series cast member Walter “Chekov” Koenig, who is not reprising his role for the animated series.
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