The Doctor: But you use your powers for evil!
Sutekh: Evil? Your evil is my good. I am Sutekh the Destroyer. Where I tread, I leave nothing but dust and darkness...I find that good!
Sutekh: Evil? Your evil is my good. I am Sutekh the Destroyer. Where I tread, I leave nothing but dust and darkness...I find that good!
- Koquillion, from season 2's "The Rescue", is also known as Bennett. To cover up a murder he committed, he murdered the crew of a human explorer ship, before wiping out the population of the peaceful planet Dido, unintentionally leaving only two survivors. He then lies to Vicki, the only other survivor of the ship and the daughter of one of the killed crew members, that the natives killed the crew, only keeping Vicki alive to corroborate his story. To maintain the illusion he disguises himself as Koquillion, and plans to convince the authorities to destroy the planet to removing all traces of his crime once they are both rescued. Upon the TARDIS arriving, he immediately tried to murder its crew as well, pushing Barbara off a cliff and causing a cave-in that buried the Doctor and Ian alive.
- The Great Intelligence was one of The Doctor's vilest and most powerful recurring foes. Arrogant, extremely callous, and sadistic in nature; on multiple occasions it attempted to conquer the Earth and wipe out mankind, solely to grant itself a permanent physical form. For one such plot in his debut, the Intelligence enslaved a kindly Tibetan monk, and kept the man alive for three hundred years solely to serve it, leaving its victim with just enough freedom to be aware of this and to be tormented by the knowledge of what he had been used for. A being of pure consciousness, it casually used its powers to brainwash, possess innocent people, or harvest the souls of living beings in the pursuit of its plans.The Intelligence also practiced a cruel form of destruction on people, manipulating them since childhood until it throws their lives away for its own benefit. Enraged by its defeats, the Intelligence made a final attempt to utterly break the Doctor by personally undoing every single victory he had ever won and destroying every friendship he had ever made by infecting every moment of the Doctor's lifetime, forcing him to feel this happening to him as he does so. Despite the great destruction this would cause throughout the universe and even though this would be fatal to the Intelligence as well, it was happy to do this purely out of spite at the Doctor foiling its selfish schemes.
- Ramón Salamander, from season 5's "The Enemy Of The World", while renowned publicly as a genius whose inventions helped the food shortage, secretly has his sights set on world domination. Keeping dozens of scientists prisoner in an underground shelter for five years, Salamander convinced them that a nuclear war rages on the surface and so they must create natural disasters to fight back at the evil armies ravaging the world. In fact, the disasters are killing innocent people, and Salamander is using them to gain popularity by leading relief efforts and predicting where the disasters will strike, while also discrediting the helpless officials. Others Salamander has been systematically killing, replacing all of them with people under his control. Caring nothing for his followers, Salamander never hesitates to remove those who outlive their usefulness, discrediting his original partner-in-crime and poisoning one of his puppets when he's unable to kill his superior. Suave, cunning and audacious as he is, at heart Salamander is nothing more than a power-hungry mass murderer, who manipulates innocents into killing innocents, all for his own benefit.
- The Master is seen as the Arch-Enemy of the Doctor for a very good reason:
- The "UNIT Years" Master is the first recurring incarnation. He is a petty megalomaniac who hides under a veneer of suave charm and culture. Murdering a scientist in his first appearance, the Master leaves his shrunken corpse to signify his arrival. Masterminding the Nestene invasion, the Master causes numerous casualties and hypnotizes Jo into blowing herself up, along with the Doctor and everyone within the UNIT Headquarters. When this fails, the Master engineers his other nefarious plans: using a mind parasite to kill people through experiencing their worst fears; trying to start World War III with a nuclear missile; assisting the Sea Devils in reconquering the Earth by wiping out mankind, just to spite the Doctor and his love of humanity; using Kronos to destroy the entire civilization of Atlantis; and framing the Earth and Draconian Empire's for attacks on one-another, hoping to engineer a bloody war between the two, leaving them too weak to fight off an upcoming Dalek invasion. On the brink of death, the Master manipulates the ambitious Goth into assassinating the Lord High President, framing the Doctor, while he enacts a plan to ensure his survival, almost wiping out the Time Lords in the process. When this also fails, the Master plots his revenge for decades before trying to take the Doctor's body and remaining regenerations. Cruel until the end, this incarnation's final act is to hijack the body of the kind-hearted Tremas, killing him in the process.
- The aforementioned incarnation results in the "Tremas" Master. He possesses all the intelligence of his predecessors, coupled with a thoroughly unstable mind. First seen while attempting to conquer Logopolis, the Master's attack causes the universe to begin collapsing, destroying a quarter of it before the obliteration is stopped. Pretending to help the Doctor stop the destruction of the universe, the Master betrays and tries to use the peril to take control of the universe, lest he allow it to be destroyed and kills the incarnation of the Doctor when he foils his plans. Kidnapping Adric, the Master uses him as a living computer to painfully force him to create Castrovalva to almost kill the recently regenerated Doctor. Attempting to steal the power of the nearly extinct Xeraphin, the Master murders the first-born Xeraphin and engineers a schism that results in a purely malevolent nature for the Xeraphin Hive Mind. Sending vicious Cheetah People to Earth, the Master kidnaps many innocent humans to use as prey or be infected and become Cheetah People themselves. Infected himself, he engineers his escape to Earth and tries to build an army of Cheetah People from a supply of brainwashed youths. Uncaring that his meddling would result in the obliteration of Earth, this incarnation of the Master was a destructive sociopath who reveled in his own vile nature.
- The "Harold Saxon" Master is an unfathomably cruel, selfish psychopath who first appears in "Utopia". After successfully conquering Earth, the Master orders the population be decimated for no other reason than to satisfy his own violent impulses. Becoming a despot, the Master forces prisoners to watch as he incinerates Japan for his own amusement and abuses his servants and even his own wife. When the Master's mistreatment of his wife leads her to fatally shoot him, he refuses to regenerate, amused by the pain the Doctor will feel at being the last of the Time Lords. Once resurrected, the Master returns with an unending hunger, which he satisfies by trying to devour all humans. Although seemingly killed by Rassilon, the Master returns, creating a facility which agonizingly converts people into Cybermen and kills his own future incarnation, putting his own existence in jeopardy to avoid any version of himself aiding the Doctor.
- The Marshal, from Season 9's "The Mutants", is a petty tyrant who nevertheless stands out through sheer depravity. A ruthless, hot-tempered, trigger-happy colonial overlord, the Marshal reigns over the planet Solos, whose natives are prematurely mutating. Abusing his position, the Marshal treats the natives with contempt, hunting the mutants for sport, as well as regularly gloating how pathetic, disgusting and diseased they are. Upon learning the humans are turning the planet back over to the Solonians, leaving him without his position of power, he arranges the murder of his superior, the only man who knows this, then personally murders his own assassin, framing the innocent dissident Ky. Angered by the Doctor's interference, the Marshal attempts to kill him by sealing him in an cavern, along with Jo, Ky and two of his own soldiers, Stubbs and Cotton, then tries to gas them all. He also leads the slaughter of Varan and his fellow Solonians when they attempt to mount a rebellion, and personally shoots Stubbs In the Back for trying to warn his superiors of his treachery. To ensure his dominion continues, the Marshal attempts to alter Solo's atmosphere, thus wiping out the entire Solonian population in order for it to be repopulated by human colonists with him as their ruler.
- Davros, the creator of the Daleks, who debuted in season 12's "Genesis of the Daleks", was a crippled scientist on a planet with two races locked in civil war. To win, Davros created the Daleks: powerful, murderous creatures that could feel only hate and rage for every other species. To finalize the Daleks, when his superiors were about to cancel his immoral research, Davros engineered their extinction. Davros would return many times, improving his Daleks to wipe out or subjugate all other life with himself at their head and achieved the extermination of countless life forms. When he returned in modern times, Davros unleashed them on earth, revealing a new objective: to cause a massive chain reaction with a Reality Bomb that would result in total destruction. Nearing his death, he used the Doctor's guilt to manipulate him into coming to Skaro and then takes advantage of his pity to sap his regeneration energy to create Time Lord-Dalek hybrids. A man who has admitted he would unleash a virus to end all life solely because he could, Davros is a man who seeks power that will put him above the gods, and has remained one of the Doctor's most evil and tenacious foes.
- Sutekh the Destroyer, from season 13's "Pyramids of Mars", is a sadistic monster who desires nothing less than the extermination of all that lives so that nothing could challenge him. Once the security chief of the Osirian race, Sutekh grew so paranoid he even had his own loyal people slaughtered by his monster followers, climaxing in him destroying his home planet and the majority of his species, which forced the remaining 740 Osirians to band together and seal him away. Several thousands of years later, when archaeologist Marcus Scarman opened his tomb. Sutekh murdered Scarman and took control of his body in an attempt to free himself. He also had a devoted servant cooked to death as he didn't need him; was responsible for several innocent bystanders being strangled or crushed at the hand of his robotic servants; and finally personally tortured the Doctor before taking control of him. Upon release, Sutekh planned to use his immense powers to exterminate all that lived, declaring "all life is my enemy", knowing that nothing, not even the Time Lords, could challenge him.
- The Collector, from season 15's "The Sun Makers", is a Usurian representative of the Company, who moved humanity's population from the exhausted Earth to first Mars and then Pluto, setting up a series of artificial suns. The Collector has created a brutal dystopia in which the humans are effectively slaves, where every aspect of their lives, including breathing, are taxed, often creating a vicious cycle where they are forced to work extra shifts to pay their debts, increasing their debts through dependence on stimulant drugs, until they are Driven to Suicide. Ordinary citizens are forbidden to see the sun, rebellion is kept in check by lacing the atmosphere with a chemical that keeps everyone in a constant state of fear, and crimes are punished by constant torture at "correction centers". The Collector plans to ultimately abandon the humans when they cease to be profitable, leaving them all to die when the suns run out of fuel. He sentences Leela to execution by boiling alive, gleefully noting "This is the point where I get a real sense of job satisfaction". Ordering mandatory time off so that the workers have to listen to her screams, then orders them to work unpaid overtime to make up for the drop in production. He treats even his elite with contempt, bullying his underling, Hade, and using his personal guard as a Human Shield during a rebellion. To end the rebellion he attempts to gas the city, killing even those still loyal to him.
- Xanxia, from season 16's "The Pirate Planet", is a supposedly-dead queen of Zanak, who was so brutal and cruel that she is feared in legend long after her demise. To rejuvenate herself, she forced the Captain into transforming the entire planet into a special ship capable of jumping through space and plundering entire planets. Using this she proceed to wipe out ten entire worlds, killing untold billions, harvesting every scrap of mineral and material from them entirely so she could keep her body young, beautiful and immortal.
- Thawn, from season 16's "The Power of Kroll", is the head of a methane refinery on a satellite to which the native population have already been relocated by human settlers. Thawn's desire to see the operation expand results in him planning genocide against the native Swampies so he can expand onto their settlement. To this end, he pays a gunrunner to supply them with faulty weapons, so they're not actually a threat but he can use the weapons as an excuse to slaughter them and then claim self-defense. When his plans get disrupted by the arrival of swamp monster Kroll, he laughs in delight as Kroll attacks the Swampies village openly hoping it might wipe them out, a moment that leaves his entire crew staring in disgust. He then decides to take advantage of the situation by launching a bombardment against Kroll, while also wiping out the Swampies as "collateral damage". Openly expressing his contempt for them, Thawn regularly talks about the Swampies as though they're mere animals, outright stating that his Swampie servant doesn't count as a person. When one of his crew objects and tries to stop the bombardment, Thawn, without a moment's hesitation, shoots him In the Back. Despite his overall low standing, by being willing to wipe out an entire race out of irrational hatred and the prospect of commercial gain, Thrawn managed to sink to a depth of depravity matched by few.
- Rassilon, debuting in "The Five Doctors", is the once-proud leader of the Time Lords. After he became twisted, Rassilon sought immortality and power at the expense of all reality and everything that lived. Rassilon was the one responsible for the Master's madness, hoping to use him as an eventual pawn. Over the course of the Time War between Time Lords and Daleks, Rassilon opted for a Final Solution: to wipe out all of space and time so the Time Lords would remain as pure consciousness, yoked to his will because he didn't see any other way to end it. Making things worse, he kills unnamed Time Lords for suggesting that they allow the Doctor to wipe out Gallifrey and end the Time War for the good of the rest of the universe and all that are suffering in it, because he doesn't want to die. With Gallifrey's survival, Rassilon hatches a scheme to trap the Doctor in his confession dial, resulting in the death of Clara and the Doctor trapped for four and a half billion years. When the Doctor finally escapes and returns to Gallifrey and refuses to cooperate with him, Rassilon tries to have him executed, despite everyone else seeing him as a war hero. Even in the past, Rassilon had showed a predilection for "cleansing" lesser species, and knows his actions will release a variety of evil and demonic forces that had been locked away after the Time War, but he does not care about this.
- Morgus, from season 21's "The Caves of Androzani", is the leading businessman of a human colony and descendant of the original settlers, whose power comes from his control of spectrox, which when refined can extend human life. He gained the monopoly with Sharaz Jek, who built the androids needed to harvest the toxic raw spectrox, then set Jek up to be killed in an eruption of boiling mud. The surviving Jek took revenge by using his android army to take control of the spectrox cave, but Morgus responded by financing a military expedition against him and then paying gunrunners to supply Jek with weapons in exchange for spectrox, deliberately prolonging the war so spectrox will remain scarce and he can charge higher prices. Morgus blows up one of his own mines just to increase the scarcity of the copper produced there, with massive loss of life, and closes down several factories, shipping the now unemployed workers to labor camps where he has just opened factories, turning them into his slaves. When the Doctor and Peri are suspected of being gunrunners, he orders them executed without trial as scapegoats. Then, learning the Doctor is still alive, he assumes he's part of a government investigation and kills the president by pushing him down a lift shaft, then spins it as an assassination attempt on himself and orders the lift maintenance man shot. Willing to murder any number of people for even the slightest personal gain, even in a complete Crapsack World, Morgus manages to stand out as a monster.
- Gavrok, from season 24's "Delta and the Bannermen", leads the Bannermen in a genocidal war against the Chimerons, wiping out the whole race except their queen Delta, who flees with the egg containing her daughter. Determined to wipe out this last Chimeron and the only surviving witness to his crime, Gavrok first goes to the tollport where she was last seen, gets all the information the tollmaster has out of him, tells him he's free to go then shoots him In the Back. He puts up a bounty for information on Delta's whereabouts, and when a Bounty Hunter contacts him to say she's on Earth, he gets a fix on the man's beacon and then blows it up, killing him. He blows up a bus full of innocent tourists, killing dozens, in case Delta is on board. When the Doctor approaches him under a white flag, Gavrok casually blows it away. On leading his final assault, he tells his men to kill everyone else but leave the princess, who has now developed to the appearance of a young teenager, for him, seemingly just for the satisfaction.
- John Lumic, from season 28's "Rise of the Cybermen" and "The Age of Steel", is the creator of the Cybermen. Lumic is a cold-blooded, amoral snake of a man who was suffering from a terminal illness. To discover a path to immortality, Lumic had homeless people abducted and experimented upon to convert them into Cybermen, leaving their human brains trapped in robot bodies, forced to act to their programming. When the British government refused to bankroll Lumic's project, he decided to overthrow it by dispatching a horde of Cybermen to liquidate any potential dissidents to his rule, intending to eventually spread them across the globe.
- Max Capricorn, from the 2007 Christmas Special "Voyage of The Damned", is a cyborg businessman who founded and owns a space liner company. Seeking revenge against the company's new board for voting him out, he attempts to frame them for genocide. Bribing the terminally ill captain of one of the cruise liners to lower shields and allow the ship to be critically damaged by a meteor storm, he causes the deaths of most of the two thousand crew and passengers, with Capricorn reprogramming the ship's robot servants to wipe out any survivors. Capricorn's plan is to have the ship crash into Earth, where the explosion of its engines will wipe out the entire population. The board will be blamed and Capricorn can retire quietly with money he has hidden away. To top it all off he ensures he himself is hidden aboard the ship, so he can watch as his plan comes into fruition. Possessing perhaps the pettiest reasons to commit mass murder in entire franchise, the Doctor rightfully views Capricorn with the disgust and contempt he deserves.
- House, the sentient asteroid from season 32's "The Doctor's Wife," is a creature that has butchered hundreds of Time Lords unlucky enough to land on his surface and stitched their bodies into subservient playthings—also taking over the mind of an Ood to act as a servant—then hijacked the TARDIS for use as a new body, leaving the Doctor behind to die on the collapsing remains of his old body—and condemning its playthings to die without his influence. House then decides to use the Doctor's companions Amy and Rory as its new toys, forcing them into the labyrinth of the TARDIS corridors, torturing the two of them with nightmarish illusions, and taunting them with its catchphrase: "Why shouldn't I just kill you now?" House is a being that operates solely according to its sadistic principles of amusement and enjoys torturing whoever is unlucky enough to fall into its grasp. Death might be certain, but House makes certain that when the end comes, its victims will wish for death.
- Mrs. Winifred Gillyflower, from season 33's "The Crimson Horror", presents herself as a kind-hearted, altruistic old woman, but is really a psychotic madwoman who stands out through sheer scope. Opening Sweetville factory, publicly portrayed as a vision of the future, the entire place was really a trap so she could kidnap those she deemed "perfect". Through the manipulation of Red Leech venom, Mrs. Gillyflower brainwashed her followers and put her victims into suspended animation, any "rejects" simply tossed into the sewers. Mrs. Gillyflower planned to launch vast quantities of the poison into the atmosphere, wiping out all life on Earth, simply so she, and her chosen few, could create a new Eden in her image. She denies her own daughter, Ada , a place in her new world condemning her to death because of Ada's blindnesseven though it was she who blinded Ada, when experimenting upon her with the venom to provide a cure for herself. Revealing herself to be nothing more than a cruel hypocrite, Mrs. Gillyflower was willing to murder all of humanity just so she could live out her fantasies.
- Lord Sutcliffe, from season 36's "Thin Ice", is a racist businessman from Regency England who happens to capture an alien sea creature. Trapping it into the bottom of River Thames, Sutcliffe found a particularly vile way of using the creature for personal gain. During the Frost Fairs, he would lure innocent people onto the ice where he would feed them to the creature. The creature would then defecate the human remains, which Sutcliffe would then have molded into bricks to burn in his mill, having discovered they burned vastly superior, as well as being cheaper, than coal. Sutcliffe has done this for many years, racking up a body count of possibly hundreds, children included. When the last Frost Fair occurs in 1814, Sutcliffe decides to plant explosives onto the ice's surface to detonate, destroying the ice and causing dozens of people to be devoured by the creature, and later straps The Doctor and Bill Potts onto them. Upon witnessing them escape and warning people to get off the ice, Sutcliffe goes forward with his plan and detonates the explosives attempting to kill them and anyone else still on the ice. Self-admitting to be without "an ounce of compassion" and solely motivated by greed, Sutcliffe is a perfect example that sometimes humans can be just evil as any extraterrestrial threat.
- Tzim-Sha, aka "Tim Shaw", from season 37's premier "The Woman Who Fell To Earth" and the season finale "The Battle Of Ranskoor Av Kolos", is a ruthless Stenza warrior who wants to become the leader of his species. He relishes in hunting people before murdering them, stealing their tooth, and implanting it on his face, racking up a body count of approximately thirty to forty. While targeting a man named Karl Wright, he is defeated by the Doctor, but his malicious and dishonest use of gathering coils, violating one of the few standards of his own brutal race, results in the death of Graham's wife Grace. Teleported to the planet Ranskoor Av Kolos, Tzim-Sha impersonates the deity of the Ux and spends 3,407 years abusing their incredible powers to steal five planets, obliterating entire populations, in order to dominate over them as a god. During that time period, he either kills or kidnaps dozens sent in the desperate attempt to stop him, climaxing with Greston Paltraki's crew. The surviving victims are imprisoned in stasis chambers as conscious trophies. He attempts to wipe out the population of Earth as revenge against the Doctor for defeating him in the past.
- Children of Earth: The Ambassador is a member of a race of Starfish Aliens called the 456 who incorporate prepubescent children into their physiology, as their bodies produce hormones that act as euphoric drugs to the 456. The children are kept as perpetually-childlike human reefers, one child shown as having been rendered hairless and immobile as a result of forty years of being used as a drug by the 456. After initial negotiations under falsely benevolent pretenses in 1965, the Ambassador returns in 2009 and bargains with the British government to take ten percent of the world's children under the threat of wiping out all humanity; to prove its power, the Ambassador unleashes a lethal virus throughout the Thames House that leads to the death of almost everyone inside, including Ianto Jones. Expressing callous disregard for the living beings it is harvesting, The Ambassador is reflective of Torchwood's darker nature and is one of the most disgustingly evil villains to ever come out of the Whoniverse.
- Miracle Day: Oswald Danes is a former teacher, who secretly molested several of his students. He is first seen—saying his victim should have run faster—on death row for the murder of one of said students, but surviving. Danes takes Jill's offer to be the face of Miracle Day, which he revels in the attention of. When Jill reveals they plan to abandon him when is if no more use, Danes batters her then runs away. Danes heads to Wales and joins up with Torchwood. His last moments are spent bragging about how he will chase his student in hell, while he blows himself up along with the Mother.
- The president of the English Empire Nigel Rochester in "Jubilee" is one of the more disturbing villains in the Big Finish series, being a Dalek worshipping human in charge of a nightmarishly genocidal and xenophobic empire which attempts to emulate the Daleks in all the worst ways. He remains cheerfully upbeat and affable even when mutilating midgets to fit in his "toy Daleks" or beating his wife for speaking in contractions.
- Wendle Marr from "Nekromanteia" happens to be the most despicable and unlikable character from a cast made up entirely of despicable and unlikable characters. He starts off the play by sending a fleet of ships and their crew to their deaths, then has the gall to order the flagship's commander to die as per his company's protocol. When the guy refuses, he has his assistant prepare to destroy the guy's livelihood and the lives of his family. He later receives funds to help improve the horrid quality of life for the workers on his pet project, but decides to instead pocket the money for himself and kill all the workers once it is finished. He is so evil that even the aforementioned ship commander (who tries to rape companion Erimem) is more likable than him, with his assistant killing him and making the ship commander CEO of the company instead after his greed nearly causes the destruction of the whole universe.
- Corakinus, the Shadow King, believing the Shadow Kin's existence is a mistake, decides to destroy as many worlds as he can with his army. After wiping out the planet Rhodia, he relentlessly pursues the survivors Charlie Smith and Miss Andrea Quill on Earth. He kills the student Rachel Chapman in front of her boyfriend Ram Singh and slices off the boy's leg. Forced to share April MacLean's heart, he has his men search for a way to break the connection and kills them when they fail. When he duels with April he sends his minions to attack Ram. To prove how ruthless he is, he murders Ram's father and Tanya's mother right in front of them before starting the negotiation, and later attempts to kill Tanya's brothers as well. Holding Charlie's boyfriend Mattheusz Andrzejewski hostage, he orders April to surrender if she doesn't want to see the end of mankind. When she agrees, she reads in his minds that he has no intentions of respecting the bargain and plans to kill everyone no matter what they do.