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''Series/TwentyFour'' does not lack [[CompleteMonster this trope]].

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* Recurring villain Nina Myers (seasons 1-3). While terrorists have the excuse of being motivated by ideology, Nina is driven by her bottomless {{greed}}. Having infiltrated CTU, Nina fed information to the Drazen terrorists to assist in their schemes, and when [[TheHero Jack's]] wife Teri Bauer overhears Nina speaking German, Nina murders her to keep Teri from connecting her to Germany. Nina assists in numerous innocent deaths and terrorist activities, even conspiring to allow terrorists to get their hands on nerve gas. Jack Bauer once summed it up best: "You're worse than a traitor, Nina. You don't even have an ideology. You don't believe in anything."
* Ramon Salazar from season 3 was a brutal psychopath of a drug dealer. Since his release from prison, Ramon killed numerous innocent people. Ramon was attempting to get his hands on a lethal bioweapon called the Cordilla virus for his own profit and when his own brother Hector caused problems for the deal, Ramon cold-bloodedly gunned Hector down, simply for a better payout for the Cordilla.
* Navi Araz of season 4. His BigBad boss Habib Marwan was ruthless (having been responsible for a nuclear meltdown that killed tens of thousands, attacking Air Force One, and launching a nuclear missile at Los Angeles that would have killed millions), but Navi forcibly involved his innocent teenage son Behrooz in dangerous terrorist activities that took the lives of innocents, and then ordered Behrooz's girlfriend's death at Behrooz's own hand. When Behrooz proved unwilling, Navi attempted to murder him.
* Abu Fayed has the most successful body count in Season 6. Fayed shows himself as nasty by having Jack Bauer tortured and later orders the same on a computer technician with a power drill. Fayed succeeds in having a nuclear bomb detonated in downtown LA, causing at least 13,000 deaths.
* Jack's father, Philip Bauer, from season 6, was a CorruptCorporateExecutive who helped mastermind a conspiracy that reached all the way to the President, and helped have a previous president assassinated for it, with multiple innocents dying thanks to his actions. To cover his tracks he [[OffingTheOffspring murders his co-conspirator younger son]] and later sells out his country upon being discovered, annoyed at the lack of appreciation for his work. Philip's work nearly started World War 3 and he kidnapped his grandson, fully willing to kill him if the boy didn't conform to Philip's standards of Philip's legacy.
* From the film ''Redemption'' and the seventh season, there's [[ScaryBlackMan General Benjamin Juma]] of the fictional African nation Sangala. Prior to the events of ''Redemption'', Juma engineered a coup that placed him in a position to kill thousands of Sangalans in a brutal genocide. When deposed, Juma was contacted by an [[NebulousCriminalConspiracy American conspiracy]] which offered to return Juma to power in return for being allowed to use Sangals to develop bio-weapons. Juma had the weapons tested on a civilian village, which he then had firebombed to conceal the evidence. When preparing to launch a vicious assault on Sangala's capital, Juma conscripted {{child soldier}}s and had them brainwashed. In season 7, Juma sends his right-hand man [[TheDragon Colonel Iké Dubaku]] to the US for a series of terrorist attacks and murders and then [[YouHaveOutlivedYourUsefulness has Dubaku killed]] when he is captured, to make sure [[HeKnowsTooMuch Dubaku won't reveal anything]]. Juma personally leads a paramilitary strike that captures the White House where he takes and kills hostages to show how serious he is. When he realizes his plans are foiled, Juma orders the hostages murdered and attempts to get to the President to murder her himself.
* Cheng Zhi has one of the best claims to be [[TheHero Jack Bauer's]] ArchEnemy. Originally the head of security of the Chinese consulate, Cheng subjected Jack to [[ColdBloodedTorture horrible torture]] after capturing him at the end of Day 5. Originally a loyal soldier for China, Cheng [[ItsAllAboutMe began to think only of himself and his own advancement]]. Cheng subjected Jack's former girlfriend Audrey Raines to a [[MindRape near-lobotomy]] which left her damaged for a long time after. After being thought dead, Cheng resurfaces in ''[[Series/TwentyFourLiveAnotherDay Live Another Day]]'', having been the one responsible for Margot Al-Harazi getting the override key for attack drones. Manipulating events (and eventually having a [[spoiler: sniper kill Audrey]]), Cheng tried to launch a nuclear missile to begin WorldWarIII between China and America where millions would die out of petty vengeance for China abandoning him for his criminal actions.
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