Let’s take a look at seven incredible and influential Star Trek: The Original Series episodes that have completely shaped today’s sci-fi genre.
Since its debut in 1966, the Star Trek franchise has boldly taken audiences where no one has gone before, setting a new standard for science fiction on television.
The original series, led by the charismatic Captain James T. Kirk and his very diverse crew aboard the USS Enterprise, was more than just a space adventure – it was a visionary exploration of the human condition but in space. At a time when the world was grappling with issues like the Cold War, civil rights, and the space race, Star Trek offered a hopeful glimpse into a future where humanity had overcome its divisions and explored the galaxy united. It broke new ground with its diverse cast, thought-provoking stories, and optimistic view of the future, where science and exploration were valued above all.
The series’ continuing popularity and cultural impact can be credited to its compelling episodes that combined thrilling space exploration with deep, philosophical questions. Among the long list of fantastic episodes in the original series, seven stand out as particularly influential:
- “The City on the Edge of Forever”
- “Balance of Terror”
- “Mirror, Mirror”
- “The Trouble with Tribbles”
- “Amok Time”
- “Space Seed”
- “The Doomsday Machine”
These episodes exemplify the groundbreaking nature of the original Star Trek series. They are not just stories set in space but are narratives that challenge viewers to think about larger issues – morality, war, personal identity, and the consequences of technological advancement.
Star Trek ventured into uncharted territory, both in space and in storytelling, setting the bar for all science fiction that followed. Its combination of adventure, humanism, and science has left a permanent mark on popular culture, inspiring generations of fans and creators alike.
As we revisit these seven episodes, we are reminded of the timeless appeal of Star Trek and its vision of a future where humanity’s potential is as boundless as the stars themselves.
Engage!
1. “The City on the Edge of Forever” (Season 1, Episode 28)
“The City on the Edge of Forever” is a true gem in the Star Trek universe, brilliantly intertwining time travel, romance, and moral questions. A freak accident sends Dr. McCoy back in time to the 1930s, where he accidentally alters history, erasing the Enterprise and its crew from existence.
To fix this, Captain Kirk and Spock follow him through a mysterious time portal, the Guardian of Forever. They land in the Great Depression era, a stark contrast to their futuristic world. It’s here that Kirk meets Edith Keeler, a social worker. He falls deeply in love, only to discover a cruel twist of fate: Edith must die to restore the timeline. It’s a classic Star Trek shenanigans, and we love it.
Why is this episode a standout? First, it’s the emotional core and moral dilemma that set it apart. Kirk is torn between his duty to preserve history and his love for Edith. This conflict gives the episode a depth and importance rarely seen in science fiction of its time.
The writing is top-notch, courtesy of renowned science fiction writer Harlan Ellison. It challenges the characters and the audience with the question: what sacrifices must be made for the greater good? Add to this the superb performances, especially by William Shatner (Kirk) and Joan Collins (Edith Keeler), who bring a truly palpable chemistry and heart to the story.
2. “Balance of Terror” (Season 1, Episode 14)
“Balance of Terror” is an episode that brilliantly combines the thrill of a tactical battle with deep, thought-provoking themes. Set in the endless expanse of space, this episode turns the Starship Enterprise into a stage for a high-stakes game of cat and mouse.
The suspense is real as Captain James T. Kirk and his crew face off against a Romulan vessel, armed with a revolutionary cloaking device that makes it invisible. This technological marvel elevates the tension, as each strategic maneuver becomes a critical decision in a deadly space chase. The episode is a nod to tight, suspenseful storytelling, where every twist and turn keeps viewers on the edge of their seats, eagerly anticipating the next move in this game of space chess.
What truly gives “Balance of Terror” the status of one of the best episodes in the Star Trek canon is its exploration of themes that resonate beyond its sci-fi setting. This episode mirrors the tensions of the Cold War era, reflecting the fears and standoffs that defined the period. It goes deep into the complexities of duty, prejudice, and the often-pointless nature of war.
The introduction of the Romulans and their shared ancestry with the Vulcans makes for a great subplot, particularly highlighting the suspicions faced by Spock, the Enterprise’s Vulcan first officer. This not only adds depth to the characters but also poses significant questions about identity, trust, and the understanding of those we consider our adversaries.
3. “Mirror, Mirror” (Season 2, Episode 4)
“Mirror, Mirror” puts you in a world where everything you know is flipped upside down – which is exactly what Captain Kirk and his crew experience when they’re accidentally transported to a parallel universe.
In this alternate reality, the Federation is replaced by the ruthless Terran Empire, and our familiar heroes find themselves face-to-face with their own creepy doppelgangers. It’s like looking into a twisted mirror, where Spock sports a really weird yet perfectly fitting goatee symbolizing his dark counterpart, and the usually disciplined Enterprise is a vessel of chaos. This episode is full of intrigue and suspense, as Kirk and his team must navigate this aggressive world, trying to find their way back home without blowing their cover.
“Mirror, Mirror” stands out because it masterfully combines the thrill of a “what if?” scenario with deep moral questions. It’s a wild ride seeing our noble characters dealing with their aggressive counterparts, providing a stark contrast and a look at the nature of identity and morality.
The episode brilliantly showcases how environment and circumstance can shape a person’s character. Its lasting impact is evident, as the concept of the “Mirror Universe” became a recurring theme in various Star Trek series, captivating audiences with its exploration of an alternate reality where familiar faces take on completely different roles.
4. “The Trouble with Tribbles” (Season 2, Episode 15)
“The Trouble with Tribbles” is an absolute gem in the galaxy of Star Trek episodes, standing out for its amazing blend of humor and sci-fi adventure. Imagine the Enterprise, a ship usually full of high-stakes drama, suddenly overflowing with the cutest little furballs you’ve ever seen – the tribbles!
These purring, fluffy creatures multiply at warp speed, turning the starship into a cuddly chaos. This episode brings together lighthearted moments with a dash of espionage as the crew discovers a sinister plot involving a space station, Klingons, and a ton of grain.
There’s Captain Kirk, buried under a mountain of tribbles, and Spock, ever the logical one, trying to make sense of the furry infestation. The interactions among the crew, the tribbles, and the angry station officials are pure comedic gold that holds their own to this day.
“The Trouble with Tribbles” showcases Star Trek at its most playful and inventive. While the series is loved and known for tackling serious themes and pushing the boundaries of science fiction, this episode reminds us that space exploration can be fun too. It’s a refreshing break from the usual intensity, offering viewers a chance to see their favorite characters in a new light.
The episode’s enduring popularity is a testament to its charm and wit, making it not just one of the best episodes of the original series, but a beloved classic in television history.
5. “Amok Time” (Season 2, Episode 1)
The opening episode of the original Star Trek series’ second season is a fascinating exploration of the mysterious Vulcan culture, centering around one of the most beloved characters, Spock.
The story kicks off with Spock behaving rather oddly, much to the confusion of his fellow crewmates. It’s revealed that he’s experiencing pon farr, an important part of Vulcan biology that compels Vulcans to mate or face severe physical and psychological consequences. This revelation throws Captain Kirk and Dr. McCoy into the deep end of Vulcan traditions as they accompany Spock to his home planet. The episode is quite a ride, with friendship, duty, and cultural understanding at its heart.
What makes “Amok Time” one of the best episodes in the Star Trek canon is its blend of emotional depth, cultural exploration, and Trek’s usual sci-fi shenanigans. It’s the first time viewers get an in-depth look at Vulcan, a planet whose population lives and breathes rituals and tradition and is overall completely different from Earth.
The episode is also significant for going deeper into Spock’s character, revealing layers of his personality that were previously hidden. His internal struggle between his Vulcan heritage and his loyalty to the Enterprise crew is compelling. Also, the episode features one of the most memorable fight scenes in Star Trek history, complete with dramatic Vulcan lutes as a musical backdrop – the cherry on top.
6. “Space Seed” (Season 1, Episode 22)
“Space Seed” is known for introducing one of the most iconic villains in the franchise’s history: Khan Noonien Singh. In this episode, the Enterprise crew discovers an abandoned ship, the SS Botany Bay, drifting around in space. Once aboard, they find Khan – a genetically enhanced superhuman from the 20th century – and his band of followers in a hibernating sleep.
The charismatic and cunning Khan, brilliantly portrayed by Ricardo Montalbán, quickly captivates the audience with his imposing presence and complex character. As the crew revives Khan and his group, tensions escalate aboard the Enterprise, leading to an intense confrontation between Captain Kirk and Khan.
What makes “Space Seed” one of the best episodes of the original series is not just the introduction of a memorable villain, but also its exploration of themes like the danger of unchecked power and the ethical implications of genetic engineering. The episode masterfully blends action, drama, and science fiction elements, showcasing the series’ ability to tackle thought-provoking topics while still giving us the engaging stories it’s known for.
The dynamic between Kirk and Khan is particularly compelling, highlighting Kirk’s leadership and moral compass against Khan’s ambition and ruthlessness. The episode’s lasting impact has a direct connection to Star Trek II: The Wrath of Khan, one of the most acclaimed films in the Star Trek series. “Space Seed” sets the stage for this movie, adding layers to Khan’s character and enriching the Star Trek universe.
Also, fun fact: Star Trek: Strange New Worlds‘ Lieutenant La’an Noonien-Singh is a direct descendant of Mister Khan.
7. “The Doomsday Machine” (Season 2, Episode 6)
“The Doomsday Machine” is a thrilling and dramatic adventure. In this intense story, the Enterprise and her crew encounter a massive, planet-destroying space weapon, known as the Doomsday Machine. This seemingly unstoppable force has, at this point, already obliterated entire solar systems and poses an existential threat to the galaxy.
The tension rises when they discover the badly damaged USS Constellation and its traumatized captain, Commodore Matt Decker. Decker, obsessed with destroying the machine that decimated his crew, embodies a powerful air of loss, revenge, and the dangers of obsession.
What makes “The Doomsday Machine” one of the episodes is its blend of high-stakes action and rich character development. The episode skillfully shows the psychological toll of being in command and the heavy burden of responsibility that comes with it. Decker’s character offers a haunting and humanizing look at the impact of tragedy and the lengths one might go to seek retribution.
The tension between Decker and Kirk adds a layer of drama, as Kirk must navigate not just the threat of the Doomsday Machine but also the challenge of dealing with a fellow officer on the brink of his own madness. The episode’s pacing is also excellent, keeping viewers on the edge of their seats, while its special effects were groundbreaking for the time. “The Doomsday Machine” is a classic example of Star Trek at its best, combining challenging themes with edge-of-your-seat plots, making it a must-watch for both die-hard Trekkies and casual fans alike.
These seven episodes from the original Star Trek series are more than just entertaining TV – they are timeless pieces of storytelling that continue to resonate with audiences, new and old. Each episode, with its unique blend of adventure, moral complexity, and character development, shows why Star Trek has become a cultural phenomenon. Whether you’re a lifelong Trekkie or a newcomer, diving into these episodes is like embarking on an exciting journey through the final frontier, one that promises to intrigue, entertain, and, most importantly, inspire.
Which episode of Star Trek: The Original Series was your favorite? Did we miss out any you would have liked to see on this list?