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The Top Ten Strangest Alien Races Featured on Star Trek Voyager

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by Marisa Quinn-Haisu (subscribe)
My name is Marisa. I am a fiction writer, a blogger, and a freelance journalist.
Published July 15th 2020
The Delta Quadrant is a tough part of town
The Top Ten Strangest Alien Races Featured on Star Trek Voyager
The Voyager crew is a long way from home


Best Quote:

"We're alone - in an uncharted part of the galaxy. We've already made some friends here...and some enemies. We have no idea of the dangers we're going to face. But one thing is clear: both crews are going to have to work together if we're to survive. That's why Commander Chakotay and I have agreed that this should be one crew - a Starfleet crew. And as the only Starfleet vessel assigned to the Delta Quadrant, we'll continue to follow our directive: to seek out new worlds and explore space. But our primary goal is clear. Even at maximum speeds, it would take 75 years to reach the Federation. But I'm not willing to settle for that. There's another entity like the Caretaker out there somewhere who has the ability to get us there a lot faster. We'll be looking for her. And we'll be looking for wormholes, spatial rifts, or new technologies to help us. Somewhere, along this journey, we'll find a way back."

Captain Kathryn Janeway, Star Trek Voyager, "The Caretaker"

Star Trek: Voyager was an American science fiction television series created by Rick Berman, Michael Piller, and Jeri Taylor that ran from January 1995 to May 2001. It was the fifth series in the Star Trek franchise and the fourth sequel to Star Trek: The Original Series. Star Trek: Voyager was set in the 24th century and was the first Star Trek series to feature a female captain and lead character, Kathryn Janeway (played by Kate Mulgrew). The show follows the adventures of the USS Voyager and its crew after a powerful alien strands it in the Delta Quadrant on the other side of the Milky Way galaxy. Captain Janeway must unite her crew, made up of a mix of Starfleet and ex-Federation colonists known as Maquis, if she wants to get them back home to Earth. During the time Voyager spent in the Delta Quadrant, they discovered new alien worlds and races, and explored a lot of unknown space. The unique setting of Star Trek: Voyager meant the show creators were able to create brand new alien races never seen before in Star Trek. This article will contain spoilers.

1. The Caretaker (The Nacene)

The Top Ten Strangest Alien Races Featured on Star Trek Voyager
The Caretaker changes the lives of the Voyager crew forever


Type: Sporocystian lifeform
Place of Origin: The Delta Quadrant
Encountered Voyager: 2371
Episodes Featured in: "Caretaker", "Cold Fire", and "The Voyager Conspiracy"

The Nacene are a non-corporeal, energy-based, sporocystian species native to the Delta Quadrant. The Nacene had the ability to change their physical appearance. In their natural state, they appear as a gelatinous shifting shape, shimmering with light. In death, they become smaller, and harden into a physical rock. As a race, the Nacene have achieved a number of impressive accomplishments. They have developed high-level holographic, medical and transport technology. They have a deep understanding of subspace, enabling them to exist and manipulate the other realm, and can transport entire starships across thousands of light years in moments. The Nacene think of themselves as explorers. Voyager first encountered the Nacene when a member of the race, called the Caretaker, used a displacement wave to drag their vessel from the Alpha Quadrant into the Delta Quadrant. The Caretaker, Voyager would later discover, was dying and was using the displacement wave to search for a compatible lifeform to procreate with. The Caretaker needed to create a successor who would continue to care for the Ocampa, an alien race he cared for. The Caretaker died before being able to transport Voyager home again. Captain Janeway decided to destroy the array the Caretaker used to bring them to the Delta Quadrant to stop it from falling into the hands of an alien race called the Kazon, who were threatening the Ocampa. Her decision ended up saving the Ocampa from the Kazon, but also stranded Voyager in the Delta Quadrant.

2. The Night Aliens

The Top Ten Strangest Alien Races Featured on Star Trek Voyager
Voyager discovers life exists inside the void


Type: Humanoid
Place of Origin: The Void, Delta Quadrant
Encountered Voyager: 2375
Episode Featured in: "The Void" Season 5, Episode 1

The Night Aliens are an unnamed humanoid species native to a region of the Delta Quadrant devoid and stars and light nicknamed "the void" by the Voyager crew. The Night Aliens have inhabited the void for millions of years and have evolved to survive in complete darkness. They are also extremely photosensitive. The Night Aliens are a technologically advanced race, possessing starships that use dampening fields to drain energy from ships that enter the void. When Voyager first encounters the Night Aliens, they attack their ship, because they think that they are allies with their biggest enemy, the Malon. The Malon have been dumping antimatter waste into the void, bringing great harm to the Night Aliens, who have begun to suffer from the toxic effects of theta radiation exposure. After learning that the Malon are killing the Night Aliens, Voyager offers to help stop the Malon from further polluting the void, by destroying a spatial vortex that allows them to enter the region. I really love the unique look of the Night Aliens and find their physiology fascinating.

3. The Vidiians

The Top Ten Strangest Alien Races Featured on Star Trek Voyager
The Vidiians were one of the most horrifying villains ever featured on Star Trek Voyager


Type: Humanoid
Place of Origin: Delta Quadrant
Encountered Voyager: 2371
Episode Featured in: "Phage", "Faces", "Lifesigns", "Deadlock", "Resolutions", "Coda", "Infinite Regress", "Fury" and "Critical Care"

The Vidiians are a humanoid species native to the Delta Quadrant that suffer from a debilitating disease called the Phage which eats their skin and organs and damages their DNA. The Vidiians used to be a prosperous race known for being educators and explorers. All of that changed when the Phage attacked them 2,000 years ago. The Vidiians became so obsessed with fighting the Phage, they turned all of their efforts into developing highly advanced medical technology to defeat it and by the 24th century had started harvesting the organs of other species to replace their own as they failed. Voyager first encountered the Vidiians in 2371 when they investigated an asteroid that the Vidiians were using as an organ harvesting facility. The Vidiians were fantastic villains in Star Trek: Voyager. I loved their backstory fighting the Phage, the fantastic makeup that went into creating their appearance and their struggle to balance medical ethics with their own survival.

4. Automated Personnel Units

The Top Ten Strangest Alien Races Featured on Star Trek Voyager
The crew of the USS Voyager stumble into the middle of a robotic war


Type: Automated Personnel Unit (robotic android)
Place of Origin: Delta Quadrant
Encountered Voyager: 2372
Episode Featured in: "Prototype" Season 2, Episode 13

In 2372 Voyager discovered a barely functioning android floating in space with very little power left. Chief Engineer B'Elanna Torres was able to reactivate it. The robot wakes up and states its name and thanks B'Elanna for reactivating it. The robot is a type of android called an Automated Personnel Unit. The Automated Personnel Units were created by the Pralor and the Cravic, two different alien species, in the early 23rd century. The Pralor and the Cravic were at war with each other and created the Automated Personnel Units to fight the war for them. The Pralor and Cravic Automated Personnel Units called their creators "Builders". When the Pralor-Cravic war came to an end, both sides agreed to deactivate the Automated Personnel Units as a sign of good faith. The units, fearing for their own safety, turned on their creators, exterminating both races, and then resumed the war. After B'Elanna reactivated one of the Pralor automated personnel units, she was kidnapped by the androids and forced to work as a builder, to help them make new units so they can continue their robotic war forever.

5. The Clown

The Top Ten Strangest Alien Races Featured on Star Trek Voyager
There's nothing funny about this clown.


Type: Hologram, humanoid
Place of Origin: Kohl settlement, Delta Quadrant
Encountered Voyager: 2372
Episode Featured in: "The Thaw" Season 2, Episode 23

The Clown is one of the most unique and terrifying entities that the Voyager crew encounters during their time in the Delta Quadrant. The Clown was a holographic personification of the fears of five individuals linked to a neural network. The network was set up to save members of the Kohl settlement, which was wiped out by a solar flare. The plan was the neural network would keep the minds of the inhabitants active while they waited fifteen years for their planet to recover from the environmental catastrophe. The Clown was created from the feedback between their minds which the network used to transform their darkest fears into a malevolent manifestation. Voyager discovered the Kohl settlement in 2372 and the surviving aliens hooked up to the neural network. Harry Kim and B'Elanna Torres connected themselves to the neural network to talk to the inhabitants and discovered that the Clown was holding them hostage. The Clown needed brains to be hooked up to the network for him to exist, but at the same time he took glee in torturing the hostages and killing them off slowly, while always leaving one left for him to play with. I love the Clown. He is delightfully creepy and played with utter glee by Michael McKean.

6. The Cytoplasmic Lifeform in "Nothing Human"

The Top Ten Strangest Alien Races Featured on Star Trek Voyager
The Doctor must work to save B'Elanna Torres from an alien that is threatening her life


Type: Cytoplasmic lifeform
Place of Origin: Delta Quadrant
Encountered Voyager: 2375
Episode Featured in: "Nothing Human" Season 5, Episode 8

In the episode "Nothing Human" Voyager discovers a damaged spaceship containing a sentient and highly intelligent cytoplasmic lifeform onboard. The creature resembled a large insect and communicated with a language that was indecipherable to Voyager's universal translator. Unable to communicate and gravely injured, the alien attaches itself to B'Elanna Torres, piercing her neck and taking control of her autonomic systems to sustain itself. The Doctor is then tasked with trying to remove the creature without killing it and hurting B'Elanna. It's not that common for non-humanoid aliens to appear in Star Trek, so this episode is a favourite of mine, for showing an alien that is really something out of this world.

7. The Dream Aliens

The Top Ten Strangest Alien Races Featured on Star Trek Voyager
Voyager is attacked by a telepathic alien species that live out their entire lives in a dream state.


Type: Humanoid
Place of Origin: The Delta Quadrant
Encountered Voyager: 2374
Episode Featured in: "Waking Moments" Season 4, Episode 13

The Dream Aliens were a corporeal telepathic humanoid species who lived out their entire lives in a dream state. The Dream Aliens felt threatened by what they called the "waking world" and feared the "waking species" finding them in their helpless sleep state and doing them harm. To defend themselves from attack, the Dream Aliens developed a form of advanced technology, that could enable them to broadcast a neurogenic field over the distance of several light years. This gave them the ability to attack and take over starships by invading the dreams of the crew and trapping them in a shared dream or collective unconscious. Voyager encountered the Dream Aliens in 2374 when they invaded the dreams of the crew and tried to take over the ship.

8. The Voth

The Top Ten Strangest Alien Races Featured on Star Trek Voyager
The Voth share a link with the planet Earth


Type: Saurian humanoids
Place of Origin: Earth, Alpha Quadrant
Encountered Voyager: 2373
Episode Featured in: "Distant Origin" Season 3, Episode 23

The Voth are a reptilian humanoid species that originated on Earth and evolved from dinosaurs. It is theorized in the episode "Distant Origin" that the Voth are a descendent of the hadrosaur and survived the mass extinction at the end of the Cretaceous Period 65 million years ago. The Voth likely survived on an isolated island until their society developed interstellar travel and was able to depart the planet. The Voth wandered the galaxy until they settled in the Delta Quadrant and began laying the foundation of the modern Voth civilisation. Over time, the Voth forgot the truth of their origins. Around 20 million years ago, the Voth began to consider themselves a species indigenous to the Delta Quadrant, a belief which became part of their culture, history, and sense of identity. In the 24th century, a belief called the "Distant Origin Theory" began gaining traction among some in Voth society, that proposed the Voth might not be native to the Delta Quadrant. In 2372 a Voth scientist called Forra Gegen discovered evidence that the Voth originated on Earth and shared a common ancestor with humans. When he tried to share his discovery, Gegen was arrested and punished for heresy, and was forced to retract his claims to prevent himself and the Voyager crew from being sent to a prison colony.

9. The Kobali

The Top Ten Strangest Alien Races Featured on Star Trek Voyager
Jhet'leya returns to Voyager to reclaim her previous life as Ensign Lyndsay Ballard


Type: Humanoid
Place of Origin: Kobali Prime, Delta Quadrant
Encountered Voyager: 2375
Episode Featured in: "Ashes to Ashes" Season 6, Episode 18

The Kobali are a humanoid race that have a unique method of reproduction. Unable to have children through sexual or asexual reproduction, the Kobali add to their population numbers by reanimating the deceased corpses of other species and alternating their DNA to transform them into Kobali. The Kobali use a genetic pathogen to reanimate and convert the deceased body, a process taking months, that leaves only trace amounts of the original DNA left behind once completed. The resurrection process stuns the new Kobali when they wake up. It takes time for them to adjust to finding themselves alive again, in a different body, and they are trained to adapt and accept Kobali language and culture. Voyager made contact with the Kobali in 2375 when they came searching for Jhet'leya, a Kobali female, who escaped her adoptive Kobali family and came searching for Voyager, seeking to reclaim her former life as Ensign Lyndsay Ballard, who served onboard Voyager before her death.

10. The Silver Blood

The Top Ten Strangest Alien Races Featured on Star Trek Voyager
A silver blood duplicate of Ensign Harry Kim takes command of the bridge


Type: Biomimetic lifeform
Place of Origin: "Y" class demon planet, Delta Quadrant
Encountered Voyager: 2374 - 2375
Episode Featured in:"Demon" and "Course: Oblivion"

In 2374 Voyager, desperately low on fuel, lands on a "Y" demon class planet in search of supplies. Harry Kim and Tom Paris discover a mysterious pool filled with silver fluid packed with deuterium which Voyager uses to power its warp core. Harry tries to take a sample and falls into the pool. Tom pulls him back out and Kim tells him he felt like something pulled him in. The men then collapse and fall unconscious after their environmental suits fail. When the men do not return to the ship, Captain Janeway sends a search team to look for them. Kim and Paris are found alive and well and not wearing their environmental suits. They tell them that after they fell unconscious they woke up able to breathe the planet's poisonous air. It is later revealed that the pool of silver liquid cloned the two men and that the Kim and Paris the search them found were copies. The search team go back to the planet and find the real Tom and Harry, still alive, unconscious in their environmental suits.

After some investigation, the Voyager crew discover that the "silver blood" which duplicated the two men is a biomimetic lifeform that can assume the shape of anything biological or technological that it comes into contact with. Once the silver blood copied Tom and Harry, it experienced sentience for the first time. After realising he is a copy, the duplicate Kim begs Captain Janeway to let the silver blood copy the rest of Voyager and its crew, so it can populate the rest of the planet. Captain Janeway agrees to his request and later, when Voyager departs the planet, Silver Blood duplicates of the crew watch the ship lift off.

In 2375 it is revealed that after Voyager departed the demon class planet, the Silver Blood duplicates they left behind forgot they were copies, and later left the planet believing themselves to be the real Voyager crew. In the episode "Course: Oblivion" the crew discover that every single one of them, including Voyager itself, are biomimetic duplicates made from the silver blood. All of the crew have memories copied from the original Voyager crew, which is why they forgot they were copies. Over time, the ship begins to fall apart and the crew begins to die from cellular degradation, due to radiation from a new enhanced warp core. Eventually, the ship dissolves completely, killing everyone onboard.
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Why? The crew of the USS Voyager encountered a lot of strange alien races during their trek across the Delta Quadrant.
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