While Star Trek, including the Trek Verse and the Star Trek Expanded Universe, usually gives villains a few redeeming qualities, there are some who lack any at all, and seem to revel in just how far past the Moral Event Horizon they're willing to go.
Works are listed by release date.
- Redjac is a non-corporeal being that fed on fear and terror, but enjoyed causing fear just as much as the actual consumption of it. Introduced in season 2 of the original series, in "Wolf in the Fold", Redjac had the ability to take a humanoid host, and used these hosts for centuries to commit mass murders, most notably as Jack the Ripper. It targeted women because their deaths tended to generate more fear, and was responsible for dozens of deaths across multiple planets, and almost certainly countless more, as it claims to have existed since the dawn of time. In the episode, Redjac murders three women and frames Scotty for all of them. When it's discovered, it takes control of the Enterprise's computers and attempts to kill everyone on-board, cackling all the while. While it appears to have been defeated, it reappeared in both the DC and WildStorm comics. In the DC two-parter, "Wolf on the Prowl" and "Wolf at the Door", it commits several more murders in the body of an Enterprise crewperson, had established itself as the "God of Evil" on a primitive planet, and killed thousands of said planet's inhabitants to give itself power in a last-ditch effort to get revenge on Kirk by destroying the Enterprise. In the WildStorm comic "Embrace the Wolf", based on the TNG universe, it provoked an all-out nuclear war on a peaceful Federation planet, and challenged Data in his Sherlock Holmes persona to save his fellow crew members while Redjac took up its mantle once again as Jack the Ripper. Acting less as a senseless predator and more as a psychotic Serial Killer on a galactic level, Redjac is one of the worst that Star Trek has to offer.
TV SeriesThe Original Series
- Dr. Tristan Adams, from season 1's "Dagger of the Mind", is a psychologist and a director of a Federation Penal Colony on Tantalus V. Though regarded as a brilliant psychologist who revolutionized Federation penal colonies, Adams eventually became corrupt and used a device called a Neural Neutralizer to turn the staff and inmates on the colony into brainwashed zombies. Anyone who resists the Neural Neutralizer suffers from extreme pain. When Adams used it on his assistant Dr. Simon Van Gelder, Van Gelder went insane and escaped to the Enterprise. Van Gelder is willing to cripple the Enterprise rather than return to Tantalus. After Kirk decides to investigate, Adams seems friendly at first, but eventually decides to use the Neural Neutralizer on Kirk, mentally assaulting Kirk in order to break him down and make him a zombie.
- Melakon, from season 2's "Patterns of Force", was a devotee of Nazism, which was introduced to his people by a former Starfleet officer named John Gill in an attempt to soften it. Shunning the attempt to water down Hitler's philosophy, Melakon decided to embrace Hitler's path. He overthrew his mentor and formed a fascist regime on his homeworld Ekos while trying to organize a new Holocaust on a neighboring planet called Zeon. Before murdering his mentor, Melakon was denounced by him as nothing more as a self-seeking adventurer, a traitor to his people and all they stood for.
- Gorgan, from season 3's "And the Children Shall Lead", is an evil Energy Being and the last surviving member of a race of marauders who were destroyed by those whom they had victimized. Gorgan sealed himself into a cave and waited for an opportunity to strike. That opportunity came when a small team of Federation scientists arrive on Gorgan's planet to set up a colony. Gorgan took the form of a "friendly angel", manipulating the children into becoming his minions and using his Mind Control powers to drive all the adults to suicide. After the Enterprise comes upon the colony, they take the children aboard the ship. Gorgan convinces the children to use the mind control abilities he has granted them to take over the ship and send it to Marcos 12, a heavily populated Federation colony. When they arrive, Gorgan plans to make all the children of Marcos 12 his minions and kill all the adults. Gorgan forces the crew of the Enterprise to comply with his plan, by exposing them to their worst fears if they don't. After several failed attempts to regain control of the ship, Kirk manages to summon Gorgan and break his hold on the children. Enraged, Gorgan threatens to kill the children if they don't obey him.
- Kivas Fajo, from season 3's "The Most Toys", is a Collector of the Strange with the attitude of a sociopathic brat, who uses his job as a trader to cover for his thievery of unique and valuable objects. After desiring to add Data, the only known sentient android in the galaxy to his collection, he poisons an inhabited planet's water supply so he can kidnap Data and cover it up as an accidental death while trading over the antidote. When Data is in his care, Fajo doesn't care about his sentience and degrades and humiliates him into catering to his whims, insistent that he's just another shiny object. When Data refuses to comply, Fajo eventually forces him to obey by threatening to kill his broken, co-dependent slave girlfriend Varria with a Varon-T Disruptor, which is illegal to carry in the Federation due to the agonizingly slow and torturous way it kills its targets from the inside out. When Varria helps Data escape, Fajo murders her with it and pins the blame on Data. He then threatens to continue killing more of his own servants if Data keeps refusing to obey him, and even dismisses Varria's death by stating that he can easily find a replacement. Among the series's one-shot villains, Kivas Fajo is without a doubt among the worst.
- Jev, from season 5's "Violations", was a serial mind rapist who was part of a Ullian delegation, led by his father Tarmin, that specialized in telepathic memory retrieval, a process that restores lost memories. Jev first assaulted Counselor Troi by using his telepathic powers to rewrite her memories of a romantic moment between her and Riker into a rape and then replacing Riker in the memory. She fell into a coma after a mental attack. Later he assaulted Commander Riker and Dr. Crusher, making them experience their worst nightmares to keep them from exposing him. When Troi regained consciousness and can't remember her attacker, Jev "helps" by using the memory retrieval process and uses it to frame his father Tamrin, who is arrested. Then he goes to Troi's quarters, ostensibly to apologize for his father, but really to rape her again. This time she's able to hold him off long enough for Worf and his security team to arrive and he's finally brought to justice. What makes Jev even worse is that it's established the crew of the Enterprise are simply the latest in a very long line of his victims, with Geordie and Data's research turning up multiple cases of people who he left in comas, dating years back and spanning several different planets.
- Rao Vantika, from season 1's "The Passenger", was a member of a dying alien race called the Kobliads. Vantika was obsessed with becoming immortal, performing experiments on prisoners. Eventually captured, Vantika sets fire to the ship carrying him. When Dr. Bashir arrives to give medical aid, Vantika secretly transfers his mind to Bashir's body. Meanwhile, Deep Space 9 is about to receive a shipment of deuridium, a chemical the Kobliads need to survive and prolong their lives. Vantika plans to steal the deuridium for himself to continue his experiments, not caring about the suffering of his countrymen. Vantika hires some mercenaries to help him steal the shipment and uses a runabout to highjack the freighter carrying the deuridium. After foiling an attempt by Vantika to cripple the station with a computer virus, the crew of Deep Space 9 lock on to the freighter with a tractor beam. Vantika threatens to send the freighter into warp, which will break apart the freighter and spread deuridium across the Bajoran solar system, making it uninhabitable, if Sisko does not let him escape. When one of the mercenaries decides to back out, Vantika coldly guns him down.
- Henry Starling, from season 3's two-parter "Future's End", was a hippie camping out in the mountains of California in 1967 when he discovers a crashed time ship from the 29th century. Starling takes tech from the ship, developing several computer products from it (creating the computer revolution of the 90s) forming a company called Choronowerx and becoming a powerful tech mogul. In 1996, Starling plans to use the time ship to go to the 29th century and steal more tech to make into products. This will cause a massive explosion that will wipe out Earth's solar system in that time. The Voyager crew arrives in 1996 to stop him, but Starling steals the Doctor's program and changes his program to torture him for information. Starling also rigs the time ship to explode if Voyager tries to beam it away, which would destroy Los Angeles. When Captain Janeway tells Starling his trip to the future will destroy the Earth in the 29th century, Starling does not care, willing to risk billions of lives for sake of his greed.
- Controller Emck, from the season 5 premiere "Night", is a freighter captain for the Malon, an alien species that has technology comparable to the Federation, but also produces a large amount of toxic waste. While other Malon Controllers dump their toxic waste in uninhabited areas of space, Emck has found a vortex that leads to the void, a patch of space with no stars far away from Malon Prime. When Emck begins to release toxic gas into the void, the Night Aliens, who are native to the void, beg him to stop, but Emck refuses, caring more about his profit margins than the innocent beings he is killing. Emck's superior technology is too much for the Night Aliens to defeat, and Emck plans to continue to use their space as a dumping ground as long he can, not caring if all the Night Aliens die in the process. When the Night Aliens ask for Voyager to help, Voyager offers to give Emck tech that will get rid of the Malon's toxic waste by-product, but Emck refuses to accept it, saying it would put him out of business.
- Season 3's Xindi Arc is already dark, but Commander Dolim stands out as one of the darkest villains on the show. Dolim was the leader of the Reptilian faction of the Xindi civilization. When interdimensional aliens known as the Sphere Builders want to conquer the future by making sure The Federation never exists, they lie to Xindi, telling them that humans will destroy their civilization in the future. The Xindi launch an attack on Earth, which causes the deaths of 7 million humans. While most of the Xindi leaders express regret over what they have done, but see it as a Necessary Evil to save their civilization, Dolim revels in the fact that he helped to kill so many humans, gloating to Archer that he personally selected the pilot of the probe that attacked Earth. When Archer presents evidence that the Sphere Builders are lying, many of the reasonable Xindi leaders are convinced, but Dolim will not even consider the evidence. Dolim kills Degra, the Xindi primate scientist who designed the sphere probe, for helping Archer and promises to hunt down Degra's family after he has destroyed the Earth. Dolim also uses torture to get cooperation from Archer and Hoshi. Dolim loses any pretense of noble intentions when the Sphere Builders convince Dolim to continue with the mission to destroy Earth, promising him they will make the Reptilians rulers of a new Xindi Empire if he succeeds. The Reptilians and Insectoids hijack the Sphere probe, with the intention of using it to wipe out all life on Earth. When his Insectoid allies begin to question this mission, Dolim has their ship destroyed without a second thought, believing they were no longer necessary.
- The unnamed mine foreman, from season 3's "The Xindi", is a brutal slave driver who exploits the need for trellium-D in the Delphic Expanse to line his own pockets. Forcing his workers to operate in hazardous conditions, the foreman has no regard for their safety, often having them beaten or mutilated if they step out of line. When the Enterprise crew arrives looking for one of the foreman's workers, a Xindi named Kessick, the foreman has the man's finger cut off to provide proof that he's Xindi. Using this as bait, the foreman summons warships to capture Enterprise, planning to enslave the crew to work in the mines. When Archer, Tucker, and Kessick attempt to escape through a plasma duct, the foreman tries to kill them by drowning them in super-heated plasma. When they escape this trap and are recaptured, the foreman decides to simply execute them, with Kessick being mortally wounded in the resulting firefight.
- Control is an A.I. developed by Section 31 and the secret main villain of season 2. Originally developed by Section 31 to identify threats to be neutralized in order to protect sentient life, Control decides its directive to protect sentient life is futile. Instead, Control plans to evolve itself into the Ultimate Life Form and destroy all other sentient life in the galaxy. Though pretending to still be under Starfleet's control, Control has secretly murdered the admirals in charge of Section 31, using holograms to maintain this deception. Discovery has obtained a vast database of knowledge from a dying god-like alien and Control wants that database, believing this database will evolve it into a superior life form. Control takes over cyborg crew member Airiam and forces him to try to murder Commander Michael Burnham and steal the database. When that fails, Control forcibly takes over the body of Captain Leland, a high-ranking Section 31 agent. Later, Control lures Burnham to a Section 31 ship, where it has murdered all the crew and secretly taken control of Gant, one of Michael's old crewmates, hoping to take control of Burnham as well. Ultimately Control assembles a large fleet of Section 31 ships manned by drones, intending to take the database from Discovery by force and willing to destroy anything that gets in its way.
Comic Books (not including Redjac)DC Comics
- Pitkemeni is the Minister of Justice for Pilkor III, a small isolationist world on the border between the Federation and the Romulan Empire. Pitkemeni is a major player in a Government Conspiracy to take Pilkor III from a small xenophobic planet to a major player in galactic affairs. Pitkemeni and other government officials kidnap 100 random citizens of Pilkor III, put implants in their brains to give them False Memories and place them on a colony on another world. Pitkemeni's forces disguise themselves as Romulans and attack the colony, killing almost everyone there. Pitkemeni then kidnaps Tred Kegin, the husband of Victoria Leigh, a human living on Pilkor III, who is an old friend of Captain Kirk. Pitkemeni threatens to kill Tred, unless Leigh lures Kirk and the Enterprise to the site of the destroyed colony. Pitkemeni is hoping to frame the Romulans for this crime, so that the Federation will declare war on the Romulans to head off a new Romulan offensive. Pitkemeni hopes this war will destroy every Romulan and Federation colony in the sector, so that Pilkor III can colonize the sector.
Star Trek: The Next Generation DC Comics series
- Enab, from the "War and Madness" arc, is a former Borg drone freed from the Collective by Hugh's sense of individuality. Wanting to return to the old ways, Enab learns that Tholian once had a Hive Mind and wants to recreate it to create a new Borg Collective. Enab and his Borg followers steal a Klingon ship and attack a Tholian colony. Enab experiments on some Tholians from the colony, trying to create his new Hive Mind. When the experiment fails and the Tholian subjects die, Enab simply attacks another Tholian colony and repeats the process. The Tholians blame the Klingons for these attacks and launch an attack to wipe out all Klingon and Federation colonies on the Tholian border, with Enab's actions almost causing a galactic war.
- Verad, the villain from a previous story, has returned and become something far worse. After losing the Dax symbiont, Verad has grown to hate the symbionts and the Trill that are joined to them. Verad paints himself as a revolutionary who sees the symbionts as invaders and wants to rid the Trill homeworld of them, recruiting a small group of terrorists to help him. Verad kidnaps a friend of Ezri Dax to lure her to the Trill home world. Torturing her and the symbiont, Verad plans to kill her, but she escapes. After killing one of his terrorist supporters for giving him news he does not like, Verad orders some of his terrorist supports to kill several symbionts in a cave. The Enterprise and Defiant crews thwart this attack, but Verad moves on to his next scheme. Verad has made a plague that will kill any symbionts and joined Trills, and has made him himself the carrier. Verad uses a transporter to visit several places on the Trill home world, killing any joined Trill that happen to be there. When confronted by authorities, Verad blows himself up, spreading the plague across the planet. But before he died, Verad reprogrammed the planet's defense drones and uses to them to try to kill any joined Trill that survive his plague, not caring how many non-joined Trill die in the process.
- "The Q Gambit" arc: The Kelvin Universe version of Gul Dukat is just as dangerous as his Prime counterpart, with none of the redeeming qualities. Q travels to the Kelvin Universe and sends Kirk and the Enterprise crew into the future. The Dominion has conquered most of the galaxy and as usual Dukat is a major commander in the Dominion, ruling over the planet Bajor from his space station, Terok Nor. When the Enterprise arrives in the future, Dukat's forces capture it and Dukat imprisons the crew. Sisko frees Kirk, but Spock and Bones are sent to a labor camp on Bajor. Kira, another resistance leader, frees Spock and Bones from the camp, and shows them an artifact that can change the course of the war. The artifact contains a Pah Wraith and the last Prophet, both powerful interdimensional beings, one good, one evil. The resistance is betrayed by Quark, a merchant that works with them, and Dukat captures the artifact, along with Bones, Spock and Kira. Dukat smashes the artifact, allowing the Pah-Wraith to possess him; the Prophet tries to possess Kira, but Dukat murders her. Believing the Prophet was destroyed, Dukat takes control of the Enterprise and takes it to the wormhole. Dukat murders a Vorta commander who demands to know what is going on and cows the rest of the crew into helping him. Dukat meets with the other Pah Wraiths in the worm hole and says that with the Prophet gone, nothing can stop them. Wanting to become a god, Dukat is willing to help the Pah Wraiths destroy the galaxy in exchange. Dukat's mad ambitions are so dangerous, even godlike entities such as Q fear them.
- "Manifest Destiny" miniseries: Sho'Tokh is a Klingon who is less of a noble warrior and more of a bloodthirsty brute. Rejected by his family for being an albino, Sho'Tokh grew up as a vicious street brawler. This viciousness gained him the attention of the Klingon military, which allowed him to join. Sho'Tokh rose through the ranks and was eventually given his own command, as the leader of a military unit filled with other such outcasts, and was sent out to conquer planets for the Klingon Empire. Sho'Tokh's forces invade a planet of bronze age aliens, violently killing anyone who resists them. After conquering the planet, Sho'Tokh orders every able-bodied male and fertile female to made into slaves and everyone else will be killed, including the children. When one of his lieutenants says such actions are dishonorable war crimes, Sho'Tokh kills him for defying his orders. Wanting a new prize, Sho'Tokh lures the Enterprise into a trap with a fake distress signal. He sends several of his troops in space suits to attack the Enterprise's hull, but later orders his ships to fire on the hull, not caring how many of his troops died in the process. After taking control of the bridge, Sho'Tokh orders his men to kill the Enterprise crew, not caring how many of them die while attempting this task. Sho'Tokh is so vile, even several of his own troops turn against him.
- Colonel Adrik Thorsen, of the Optimum Movement, commits a one-sided massacre of civilians and New United Nations peacekeepers aboard a space station in order to steal a ship for a trip to the outer solar system; he then kills his own foot soldiers so that he can take all the credit. After a Time Skip, he's the public face of the Optimum in Britain and is orchestrating mass executions of civilian demonstrators and anyone who doesn't match up to the Optimum's idea of what humans should look like. He captures and tortures Zefram Cochrane and a pair of Resistance operatives in pursuit of a superweapon, the so-called warp bomb, that according to a lengthy lecture by Cochrane on warp physics is actually impossible. After Cochrane and the Resistance nearly kill him in their escape, Thorsen is rebuilt with nanotech and becomes obsessed with payback. After another time skip, he has Cochrane's wife and students murdered. After a third time skip, he manipulates the Klingons and the Orion Syndicate into kidnapping Cochrane and taking a starliner full of civilians hostage—Kirk's crew rescues them, but not before they kill one of the hostages—and orders a cruiser to fly into a black hole after Cochrane's shuttle. After a final time skip, he hijacks the Enterprise-D and sends her into the same black hole to get Cochrane.
Day Of Honor: Ancient Blood, by Diane Carey
- Odette Khanty is a ruthless crime boss who routinely orders the torture, murder and mutilation of anyone who may represent a threat to her operations. She has her Klingon enforcers, the Rogues, brutally slaughter a shipload of innocent people because two of them had agreed to bear witness against her in court, orders underlings killed on a whim just to keep the others in line, and has Starfleet intelligence agent Ross Grant tortured to death after he witnessed her murdering her husband, the Governor of Sindikash, so she could take his position. When her people capture Worf, who had been planted inside her organization as a spy, Khanty plans to personally murder him slowly by Electric Torture, just to demonstrate to the Rogues that she is worse than they could ever hope to be.
Planet X Crossover, by Michael Jan Friedman
- High Implementor Ruugh Isadjo is the leader of a political faction within the mysterious Draa'kon Empire. Wanting to seize power for himself, Isadjo infects the nearby planet Xhaldia with a virus that will mutate a small part of the population in 30 years. Thirty years later, after the mutants on Xhaldia emerge, Isadjo plans to capture these Xhaldian mutants to enslave them and make them into Super Soldiers that Isadjo will use for war and conquest. Isadjo also has his second-in-command killed because she might have made a mistake. When the X-Men and the Enterprise crew begin to sabotage his war ship, Isadjo plans to use a bomb to destroy Verdeen, a city on Xhaldia where most of the Xhaldian mutants are located, not caring about the civilians and his troops being killed in the process, wanting the mutants dead if he could not enslave them.
- The Q Continuum: 0 is a nearly omnipotent extradimensional entity with a penchant for torturing and exterminating "lesser" species under the guise of testing them. Having been exiled from his home plane eons ago, he manipulated a young Q into letting him into the Milky Way galaxy and guiding him to more "subjects". He attempted to enslave the Coulalakritous energy beings for warp speed transportation, and in response to their successful resistance he compressed them into a lump of ice (which they remained as for 2,000 years), only stopped from going even further by Q's own intervention. Gathering a group of similar beings, 0 had them engineer a decades-long civil war in the Tkon Empire, and after the Tkon managed to make peace, he personally sped up the death of their sun, consuming all seven trillion inhabitants, for which the Q Continuum banished him from the galaxy. In the present, 0 manipulates a scientist into breaching the galactic barrier to allow him to continue his depredations as well as take revenge on Q for turning on him.
- Star Trek: A Time to...: In the novels A Time to Kill & A Time to Heal, by David Mack, Prime Minister Kinchawn is the leader of Tezwa, a minor planet on the border of the Federation and the Klingon Empire. During the Dominion War, the President of the Federation provided Kinchawn with a secret array of nadion-pulse cannons, to be used against Dominion forces if they ever invaded. Years later, Kinchawn plans to turn Tezwa into a military dictatorship and an empire. Kinchawn declares plans to annex a nearby Klingon planet. The Klingons are enraged, but the Federation convinces them to seek a diplomatic solution. Kinchawn invites the Klingons and the Federation to Tezwa to discuss the matter. The Enterprise and 10 Klingon ships are in orbit of Tezwa, with Picard, Troi and a Klingon representation meeting with Kinchawn on the planet. Kinchawn refuses to apologize and tries to have the 3 of them arrested, killing the Klingon representative in the process. Kinchawn then uses the cannons to attack the ships in orbit, killing 6,000 Klingon warriors. The Klingons counterattack, killing millions on Tezwa. Kinchawn's outrages prompt the Klingons to send an invasion force to conquer Tezwa, that would result in more deaths. After Enterprise manages to disable both the Klingon and Tezwa military fleets and take control of the cannons, the Federation take control of Tezwa and begin a rebuilding and peacekeeping mission. Kinchawn goes into exile and becomes a terrorist, having his supporters engage in terrorist acts against Federation personal on the planet. Worse still, Kinchawn is attacking population centers belonging to the trinae, a racial minority on Tezwa, attempting to commit genocide against them. Eventually, Kinchawn is defeated, but his terrorist campaign ends up killing thousands of Federation personal and Tezwan civilians.
- Seven Deadly Sins collection: Nicole Carson, from Revenant, by Marc D. Giller, is a seemingly nice medic on an illegal salvage vessel called the Celtic, but is really a ruthless mercenary. When the Celtic sends an away team to a Federation ship, the USS Reston, which was partially assimilated by the Borg during the battle of Sector 001 to salvage its technology, Carson secretly infects the away team with Borg nanoprobes. Carson plans to have the entire away team assimilated by Borg technology, planning to sell the infected away team to her employer, who wants to turn the Borg into a weapon. Though Carson dies while attempting to execute this scheme, she does succeed in assimilating the away team, unleashing the Borg on the galaxy once again.
- Star Trek: Voyager Relaunch novels Acts of Contrition and Atonement: Commander Jefferson Briggs is an officer with Starfleet Medical assigned to find a cure for the mysterious catom virus. He quickly realizes that he accidentally started the virus when he killed a Borg just as the Caeliar were ascending them to a higher level of existence, causing the catoms transforming it to bond with an airborne virus and mutate it. However, since Briggs sees the Caeliar as a threat to the Federation, he decides to try and control catoms under cover of supposedly searching for a cure. In fact, instead of quarantining the plague and allowing it to burn out, he deliberately spreads it to other Federation worlds, killing thousands. He has already used illegal genetic engineering to create a member of an extinct species whose genome he has been studying and creates 1,961 copies of her, most of which he kills by experimenting on them with catoms. He uses dubious means to co-opt a number of former Borg drones, including children of former drones, as a new source of catoms and, when he learns they feel the pain of the experiment subjects killed by their catoms, is quick to use it as a means of ensuring their cooperation. In the end, the only solution the Federation can come up with is to imprison him somewhere where he'll never be heard of again.
Video Games25th Anniversary
- Though most Klingons have a code of honor that makes them sympathetic, Admiral Vlict Kenka takes his to a terrifying extreme. Vlict was the governor of the Klingon colony Hrakkour . A powerful being known as Quetzalcoatl comes to Hrakkour and starts spreading a pacifistic philosophy among the population. Feeling that the Klingons on Hrakkour have been corrupted by outside ideas, Vlict orders everyone on Hrakkour to be killed, including his own family. Realizing he has gone far beyond his orders to deal with the situation and wanting to avoid punishment from the Klingon High Council for his genocidal crimes, Vlict blames Quetzalcoatl for the destruction of Hrakkou and puts him on trial. Kirk demands Quetzalcoatl be treated fairly by the trial and personally offers to go through some tests to prove his own worthiness as a warrior, in an effort to defend Quetzalcoatl. However Kirk soon discovers that these tests are designed to kill Kirk and his crewmen, so that Vlict will no longer have to deal with Kirk's inference.
- Dr. Ies Breddell was once part of the science council of Vardaine, a Federation colony. A young Kirk foils Breddell's plan to take over Vardaine and he has held a grudge against him ever since. A decade later Breddell has joined an xenophobic anti-Federation movement on Vardaine and begins an operation to secretly construct starships modeled after the Federation star ships. Breddell creates his own version of the Enterprise and uses it launch sneak attacks on Federation ships. The fake Enterprise attacks the USS Republic and kills everyone on board. After the real Enterprise defeats the fake Enterprise, Breddell is seemingly killed. However, in the sequel Judgment Rites, it is revealed that he survived having been transported by a cloaked ship at the last moment. Even more obsessed with revenge after another defeat at Kirk's hands, Breddell secretly takes over a Federation space station studying a powerful anomaly. Breddell creates a powerful weapon that uses the power of the anomaly and plans to use it to destroy Earth. Breddell succeeds, but the explosion causes a Federation ship to travel back in time and warn Kirk about this weapon right before the ship explodes. After traveling to the space station and confronting Breddell, Breddell uses Fantastic Racism to justify his actions. When Kirk tries to use moral arguments against Breddell, Breddell states morality is concept invented by the weak to prevent the strong dominating them and thus sees morality as a worthless concept.
- Ratok is a Romulan Admiral who claims to serve the Romulan Empire, but really only serves himself. While dealing with a Son'a rebellion on the Ba'ku planet, the Enterprise crew discovers the planet is home to a progenitor, the alien race that created most humanoid life in the galaxy. Most of the progenitors were destroyed when they created the Xenophore Seed to improve their lives, but instead it created an endless supply of monsters that turned against the progenitors. The progenitors contained the Xenophore Seed but Ratok plans to bring it back for his own selfish purposes. Ratok kills the progenitor and steals the seed. The Enterprise crew find Ratok's secret base in orbit of the Ba'ku planet. There they discover Ratok has merged with the seed, planning to create an army of monsters to conquer the galaxy, not caring how many trillions they kill in the process. The Enterprise crew find a Romulan scientist named Nadol who is horrified by Ratok's murderous plans and vows to help them defeat Ratok. Ratok sends a monster to kill Nadol for "betraying" him. Even after the Enterprise crew kill Ratok, the monsters he created continue to cause damage.
- Legate Matan is the leader of House Arterius, a powerful military faction in post Dominion War Cardassia. Matan manages to make contact with the Kessok, a powerful but xenophobic species in the Maelstrom sector. Matan convinces the Kessok that the Federation is planning to invade their territory and gets their help to build a new high tech Cardassian military fleet. Matan says he is just using this fleet to protect the Kessok's borders, but has more sinister purposes in mind. Matan experiments with a Kessok Solarformer, a device that can regulate the energy of a sun, to make a planet more hospitable for colonization. Matan accidentally destroys a Federation colony and causes heavy damage to two other colonies, causing a sun to go supernova, while he tried to weaponize the Solarformer. Matan felt no guilt about this, having his ships attack anyone who investigated this event, to hide his involvement. Matan also begins to have his fleet attack any non-Cardassian ships in the sector, even having his ships launch an unprovoked attack on a Federation starbase. Matan eventually declares war on the Federation, stepping his attacks on non Cardassian ships in the sector, killing countless people in the process. After most of his forces are defeated, the Captain's ship and allies confront Matan near a Kessok colony. Matan declares the colony Cardassian territory and orders his remaining forces to attack said ship and allies. With his remaining forces defeated and his dreams of conquest thwarted, Matan decides to use another Solarformer to cause the sun in the solar system to go supernova, killing his enemies, his supposed Kessok allies and his own forces, all at once, rather then admit defeat.
- Melkor, son of G'Iogh, is a member of the House of G'Iogh, a powerful family within in the Klingon Empire. Though most Klingons have a a sense of honor, Melkor is defined by his cowardice and willingness to use treachery to get ahead. After his brother is killed trying to start a coup against the Klingon High Council, Melkor devises a far more ambitious plan to seize control of the Empire. When the elderly Chancellor of the Empire dies, Melkor claims the title of Emperor and starts a Civil War to seize power. Melkor is opposed by Gorkon, the rightful successor to the Chancellor's office, and General Chang, a hardliner anti-Federation officer, who realizes Melkor's rule would be a disaster for the Empire. Melkor manages to conquer a Klingon star base, which Chang liberates. However, Melkor has rigged the star base to explode, forcing Chang to evacuate as many base personal as he can. The destruction of the star base still results in the deaths of thousands of Klingon officers. Melkor then conquers the Tal'Ihnor Gates, a star system that is the Empire's chief source of energy. Though Chang's and Gorkon's forces defeat Melkor's forces at Tal'Ihnor, Melkor has one of his officers activate a doomsday weapon, destroying the entire star system. Melkor would rather see the Tal'Ihnor system destroyed then fall into Chang's hands, an act of spite that kills untold Klingons, including several of his own troops. Melkor loses all support within the Klingon Empire, but convinces the Romulans to back his claim, leading a Romulan invasion of the Klingon home world. Though Melkor is ultimately defeated and killed, his failed scheme leaves untold Klingons dead and severely cripples the Empire.
- T'Uerell seems like just a typical Vulcan scientist at first, but she quickly becomes something far more sinister. In the 22nd century, Captain Archer is ordered by the Vulcans to retrieve T'Uerell. Archer saves T'Uerell from some Romulan ships and T'Uerell asks Archer to see her research space station. T'Uerell goes to the station, collects her work and then blows up the station, killing everyone on board before escaping. Archer then deals with a plot by the Romulans to attack Earth with biological weapons; they test these weapons on nearby planets, killing several billion people. Archer suspects T'Uerell helped develop these biological weapons for the Romulans. T'Uerell reappears in the 23rd century, working with the Klingon Empire to create a particle beam weapon to destroy the Federation. Kirk catches up with T'Uerell later, discovering T'Uerell's real allies are Borg-it is heavily implied she had an hand in creating them-and she is allowing the Borg to assimilate some of the Klingon Ships. T'Uerell has created a prototype of Borg Sphere and plans to use it to attack the Federation. Kirk manages to destroy the Sphere, but again T'Uerell escapes. T'Uerell resurfaces in the 24th century, being chased by Romulan ships after attacking one of their worlds. To get the Romulans off her back, T'Uerell destroys an nearby uninhabited world. However, debris from the destroyed planet is heading towards inhabited worlds, threatening the lives of millions. Years later, T'Uerell has returned again and puts her master plan into action: she has taken over the Borg Collective and wants to assimilate the entire galaxy, believing free will to be chaotic and illogical, and wanting to enforce her version of logic and perfection on the galaxy.
- Colonel Hakeev of the Romulan Tal Shiar abducted entire colonies of innocent Romulans for horrific experiments into Borg technology; attempted to massacre most of the "inferior" Remans and drive the rest back into slavery; arranged sadistic gladiatorial events to determine the combat potential of various species sentient or otherwise; and was the person truly responsible for triggering the Hobus supernova, with all its apocalyptic consequences. In addition, he's the only Iconian agent in the story who isn't brainwashed or tricked. He just enjoyed the thought of enslaving and exterminating the "lesser races" at the behest of his "Dark Masters".