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. 
1966-69 NBC live-action Star Trek series, set in the 23rd century after Star Trek: Strange New Worlds.
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 a tortured development history dating back to aborted early 1970s attempts to relaunch Star Trek on the big screen, Paramount premieres the much-anticipated (and much hyped) Star Trek: The Motion Picture in theaters. At over two hours, and boasting one of Jerry Goldsmith’s best movie scores, the movie bewilders viewers as much as it thrills them. Paramount claims not to make a profit on the movie at all – primarily by including all of the development costs of years of early movie attempts and the never-made Star Trek Phase II television series as part of the movie’s price tag – but, despite its assertion that the movie lost money, the studio begins making plans for a sequel.
Produced and co-written by Harve Bennett (The Six Million Dollar Man, The Invisible Man) and directed by Nicholas Meyer, Star Trek II: The Wrath Of Khan debuts in theaters. The story follows up on the first season TV episode Space Seed, bringing back Ricardo Montalban (who is now a star thanks to his stint on ABC’s Fantasy Island) as Khan and introducing Kirstie Alley as a new member of the Enterprise crew. With faster pacing, increased action, and a more contemporary military sci-fi feel, the sequel is a hit that guarantees future sequels, as well as gradually increasing interest on Paramount’s part to return the franchise to television years later.
With producer Harve Bennett now firmly in creative control of the movie franchise, Star Trek III: The Search For Spock premieres in theaters, directed by Leonard Nimoy (who, since his character is being searched for, plays only a small role as an actor in the film). The movie is a direct sequel to the events of the previous film, and sets up story developments for the fourth Star Trek movie, effectively serving as the middle chapter of a trilogy. The movie’s success confirms Nimoy’s graduation from actor to director.
Directed by Leonard Nimoy, who also has a hand in development of the story, Star Trek IV: The Voyage Home premieres in theaters. Directly following up on events in the prior two movies, Star Trek IV closes out a trilogy, and by bringing the action to 20th century Earth, complete with fish-out-of-water comedy, becomes a solid hit with an embedded ecological message. The movie’s success caps off a year-long celebration of Star Trek’s 20th anniversary
Co-written and directed by William Shatner (whose contract allows him to direct a Star Trek movie since his co-star Leonard Nimoy has done so), Star Trek V: The Final Frontier premieres in theaters to decidedly mixed reviews. This is the first movie featuring the original cast to debut during the run of Star Trek: The Next Generation, and its shaky box office performance ends Harve Bennett’s run as the creative force behind the Star Trek movies.
The first Star Trek film since 1982’s Star Trek II to be directed by Nicholas Meyer, Star Trek VI: The Undiscovered Country premieres in theaters, with Paramount billing it as the final appearance of the original crew. Depicting the earliest hints of a political alliance between the Federation and the Klingons, Star Trek VI is intended to hint at the future already playing out on TV on Star Trek: The Next Generation, and is preceded by a special two-part episode of that show featuring Leonard Nimoy. While some of the cast reprise their roles in later movies, TV episodes and even fan-made productions, this does mark the final appearance of DeForest Kelley in character as Dr. McCoy.