| The Devil in the Dark ©1978 Paramount Pictures. All rights reserved. |
| Episode: 26 Airdate: March 9, 1967 |
| 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 |
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| The Devil in the Dark | |
| Directed by | Joseph Pevney |
| Written by | Gene L. Coon |
| Produced by | Gene L. Coon |
| Executive Producer | Gene Roddenberry |
| Starring | William Shatner Leonard Nimoy |
| Featuring | DeForest Kelley Ken Lynch |
| Stardate 3196.1 The Enterprise is summoned to investigate a deadly "monster" which is menacing the miners on Janus IV. Kirk discovers that a strange rock-life being called a "Horta" has been killing the men, then escaping through solid rock! The Horta steals the air circulation pump, threatening all with death. Kirk wounds the creature, but suddenly it corners him! Will Kirk become the next victim? And how can Spock survive a Vulcan mindmeld with this alien lifeform? | |
| 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. | |