| Errand of Mercy ©1978 Paramount Pictures. All rights reserved. |
| Episode: 27 Airdate: March 23, 1967 |
| The Alternative Factor ©1978 Paramount Pictures. All rights reserved. |
| Episode: 20 Airdate: March 30, 1967 |
| The City on the Edge of Forever ©1978 Paramount Pictures. All rights reserved. |
| Episode: 28 Airdate: April 6, 1967 |
| Operation - Annihilate! ©1978 Paramount Pictures. All rights reserved. |
| Episode: 29 Airdate: April 13, 1967 |
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| Errand of Mercy | |
| Directed by | John Newland |
| Written by | Gene L. Coon |
| Produced by | Gene L. Coon |
| Executive Producer | Gene Roddenberry |
| Starring | William Shatner Leonard Nimoy |
| Guest Stars | John Abbott John Colicos |
| Stardate 3198.4 This is the first time we meet the Klingons, who threaten the Federation. Kirk and Spock attempt to persuade the council of neutral Organia to join the Federation. While they negotiate, the nefarious Klingons invade and enslave the planet's sheeplike citizens. The Organians kelp Kirk and Spock disguise themselves as civilians, only to hand them over to the Klingons! The Enterprise and the Klingon ship poise to engage in an all-out battle! | |
| The Alternative Factor | |
| Directed by | Gerd Oswald |
| Written by | Don Ingalls |
| Produced by | Gene L. Coon |
| Executive Producer | Gene Roddenberry |
| Starring | William Shatner Leonard Nimoy |
| Guest Star | Robert Brown |
| Stardate 3087.6 In orbit around an unknown planet, the Enterprise experiences a moment of "nonexistence" - all natural laws are suspended. On the planet's surface, Kirk encounters Lazarus (Robert Brown), who blames this disturbance on his evil enemy. Aboard the starship, Lazarus steals vital dilithium crystals, and we learn that Lazarus' look-alike foe is from an anti-matter universe. If Kirk can't prevent them from meeting, both universes will be annihilated! This episode features a rare angle of the Enterprise firing phasers from orbit. | |
| The City on the Edge of Forever | |
| Directed by | Joseph Pevney |
| Written by | Harlan Ellison |
| Produced by | Gene L. Coon |
| Executive Producer | Gene Roddenberry |
| Starring | William Shatner Leonard Nimoy |
| Guest Star | Joan Collins |
| Featuring | DeForest Kelley |
| Stardate 3134.0 Kirk, Spock and McCoy trapped in the 20th century! Accidentally overdosed with cordrazine, a delirious McCoy (DeForest Kelley) transports to the planet below. Kirk (William Shatner), Spock (Leonard Nimoy) and a landing party discover a "time portal" through which McCoy disappears! Suddenly the Enterprise vanishes, and Kirk and Spock must enter the vortex to search for McCoy. Arriving in 1930, Kirk falls deeply in love with Edith Keeler (Joan Collins), only to learn she must die in order for time to return to normal! | |
| Operation - Annihilate! | |
| Directed by | Herschel Daugherty |
| Written by | Steven W. Corbatsos |
| Produced by | Gene L. Coon |
| Executive Producer | Gene Roddenberry |
| Starring | William Shatner Leonard Nimoy |
| Featuring | DeForest Kelley |
| Stardate 3287.2 Spock possessed by deadly alien! The Enterprise arrives at Deneva, a planet in the path of an interplanetary epidemic of mass insanity. There, Kirk finds his brother Sam dead, his sister-in-law stricken, and his nephew unconscious. Then, Spock is attached by a flying creature! These telepathically connected parasites invade the nervous system and control their victims through pain in an effort to take over the galaxy! Can McCoy find a way to kill the aliens without harming their hosts? | |
