| Villain | First appearance | Description |
|---|
| Black Mace (Mick Yardreigh) | Adventure Comics #374 (November 1968) | A highly trained and super-strong mercenary. |
| Blight | Legion of Super-Heroes: Secret Files and Origins #2 (June 1999) | An alien race of cybernetic zombies. The Blight travel through space, infesting races they come in contact with. |
| Chameleon Chief (Jall Tannuz) | Superman's Pal, Jimmy Olsen #63 (September 1962) | A Durlan and member of the Legion of Super-Villains who can transform himself and other objects. |
| Command Kid (Jeem Rehtu) | Adventure Comics #328 (January 1965) | A resident of Preztor who is possessed by a demon. He infiltrates the Legion of Super-Heroes to destroy them, but is foiled by his weakness to gold. |
| Composite Man | Legionnaires #25 (May 1995) | A bio-engineered Durlan mutant who mimics the powers of the Legion of Super-Heroes when they arrive to stop his murderous rampage for Legionnaire Chameleon. |
| Computo | Adventure Comics #340 (January 1966) | A supercomputer built by Brainiac 5 who eventually turns against him, seeking to eradicate humanity in favor of machines. |
| Controller | Adventure Comics #357 (June 1967) | The Controllers are an alien species from another dimension. One Controller, believing true perfection to be derived from chaos, creates a Sun-Eater to attack the universe before the Legion stops him. |
| Cosmic King (Laevar Bolto) | Superman #147 (August 1961) | A resident of the planet Venus who created a matter-manipulating beam and developed its abilities innately. Shunned by the government, he becomes Cosmic King and a founding member of the Legion of Super-Villains. |
| Dark Circle | Adventure Comics #367 (April 1968) | A criminal organization founded by five members and consisting of them and their clones. In post- Zero Hour continuity, the group is depicted as a religious movement. |
| Darkseid | Superman's Pal Jimmy Olsen #134 (December 1970) | The dictator of Apokolips and an old enemy of Superman and the Justice League. After being resurrected in the 30th century, Darkseid battles the Legion. They defeat him, but he kidnaps Lightning Lad and Saturn Girl's son Garridan and transforms him into Validus as revenge. |
| Doctor Regulus | Adventure Comics #348 (September 1966) | A scientist at a nuclear power plant in Metropolis whose experiments were interrupted by Dirk Morgna. Regulus throws Dirk into a nuclear reactor out of anger, which unintentionally gives him solar abilities. Subsequently, Regulus goes into hiding and builds powered armor to seek revenge on Dirk. |
| Dominators | Adventure Comics #361 (October 1967) | An alien race of scientists ofttimes at odds with Earth. They participated in Earthwar and were part of an alliance against Earth. |
| Dynamo Boy (Vorm) | Adventure Comics #330 (March 1965) | A space pirate from New Tortuga who attempts to destroy the Legion due to the threat they posed to his people's trade. He later forms a new Legion with three members of the Legion of Super-Villains. |
| Echo (Myke-4 Astor) | Adventure Comics #355 (April 1967) | A metahuman with the ability to manipulate sound waves. He is later captured by the Khunds, who experiment on him and leave him disfigured. Afterwards, Echo is among the young criminals recruited by Tarik the Mute to join the Legion of Super-Villains. |
| Esper Lass (Meta Ulnoor) | Superboy Starring the Legion of Super-Heroes #212 (October 1975) | A Titanian with telepathic powers who was denied membership into the Legion for possessing the same powers as Saturn Girl. Subsequently, she becomes a founding member of the Legion of Super-Rejects. |
| Evillo | Adventure Comics #350 (November 1966) | The prince of the planet Tartarus, who lures criminals to his world and siphons their evil to transform innocent people into villains. |
| Fatal Five | Adventure Comics #352 (January 1967) | A group of five of the greatest criminals in the universe: Emerald Empress, Mano, the Persuader, Tharok, and Validus. They initially meet while helping the Legion battle the Sun-Eater, and decide to remain together afterward. |
| Firefist | Legion of Super-Heroes (vol. 4) #44 (June 1993) | A Khund who is forced to work with the Legion of Super-Heroes and later betrays them. He is a cyborg and possesses superhuman physical abilities. |
| Glorith | Adventure Comics #338 (November 1965) | Pre-Crisis, Glorith is an agent of the Time Trapper who he killed for her failure to defeat the Legion of Super-Heroes. Post-Crisis, Glorith becomes a frequent and dangerous enemy of the Legion using her ability to manipulate time. |
| Grimbor the Chainsman (Markx Grimbor) | Superboy #221 (November 1976) | An inventor and expert in confinement devices, Grimbor is entranced by the mutant Charma Drisden into becoming a criminal after being tasked with capturing them. [1] |
| Hunter | Adventure Comics #358 (July 1967) | Otto Orion is a master hunter and ruler of the planet Simballi. After he is killed in battle with the Legion, Otto's son Adam succeeds him as the Hunter and seeks revenge. |
| Infinite Man (Jaxon Rugarth) | Superboy and the Legion of Super-Heroes #233 (November 1977) | Jaxon Rugarth is a professor who volunteers to test a time-travelling device invented by Rond Vidar. However, he is transported through several dimensions and across time, breaking his mind and turning him into Infinite Man. |
| Justice League of Earth | Action Comics #859 (January 2008) | The Justice League of Earth are a group of Legion rejects who seek revenge and turn the people of Earth against the Legion of Super-Heroes by claiming that Superman was from Earth. |
| Khund | Adventure Comics #346 (July 1966) | A vast empire of warriors and cyborg conquerors. |
| Laurel Kent | Superboy #217 (June 1976) | Lauren Kent is a student of the Legion Academy who is believed to be a descendant of Superman. She is later revealed to be a Manhunter and self-destructs after her programming activates. |
| League of Super-Assassins | Superboy and the Legion of Super-Heroes #253 (July 1979) | A group of youths who Dark Man (a clone of Tharok) experimented on and gave powers to battle the Legion. After League member Blok leaves the group to join the Legion, its members join the Legion of Super-Villains. |
| Legion of Stupor-Bizarros | Adventure Comics #329 (February 1965) | A group of Bizarro clones of the Legionnaires created by Bizarro's descendant. |
| Legion of Super-Rejects | Superboy #212 (October 1975) | A group of youths who were rejected from the Legion for having duplicate powers. |
| Legion of Super-Villains | Superman #147 (August 1961) | First appearing as an adult villainous counterpart of the Legion of Super-Heroes, the group is summoned to the past by Lex Luthor to destroy Superman. The group was later revealed to initially be members of the School of Super-Villains that grew to eventually include most of the Legion's enemies. |
| Leland McCauley | Adventure Comics #374 (November 1968) | An industrialist and rival of R. J. Brande. |
| Lex Luthor | Action Comics #23 (April 1940) | Superboy's close friend who became his gravest enemy; when Luthor learned of the Legion of Super-Heroes the group contracted his ire as well, with him facing the group as a teenager and adult. |
| Lightning Lord (Mekt Ranzz) | Superman #147 (August 1961) | The elder brother of Lightning Lad and Light Lass who gained powers alongside them after being attacked by Lightning Beasts. After being shunned throughout his life for being an only child, Mekt becomes a criminal and founding member of the Legion of Super-Villains. |
| Luck Lords | Adventure Comics #343 (April 1966) | The name of two groups. The first is a quartet of alien criminals who were exiled from their world and wield mind-controlling technology. The second is a group of immortal mages. |
| Mordru | Adventure Comics #369 (June 1968) | A mysterious wizard who conquered the sorcerers' world Zerox and several other planets. |
| Nemesis Kid | Adventure Comics #346 (July 1966) | An undercover agent of the Khunds with the ability to develop whatever power is necessary to defeat his opponent. |
| Omega | Superboy and the Legion of Super-Heroes #250 (April 1979) | An entity created by a mad Brainiac 5 using the Miracle Machine in a bid to destroy the universe. |
| Pulsar Stargrave | Superboy #223 (January 1977) | A Coluan enemy of the Legion who claims to be Brainiac resurrected and imbued with stellar energy. |
| Ra's al Ghul | Batman #232 (June 1971) | An old enemy of Batman who possesses immortality derived from the Lazarus Pits. In the 31st century, he kills United Planets president Leland McCauley, seirz to the 31st Century where he slew the President of the United Planets, Leland McCauley, and took his place, ordering that the Legion of Super-Heroes were outlaws. By this time, Ra's had become one with the Lazarus Pits' fire and could inhabit one of many clones made of himself. |
| Roxxas | Adventure Comics #307 (April 1963) | A space pirate who previously massacred the Trommites when they refused to use their ability to transmute elements to avast a fortune. The sole survivor, Jan Arrah, joins the Legion of Super-Heroes as Element Lad. |
| Saturn Queen (Eve Aries) | Superman #147 (August 1961) | A Titanian and founding member of the Legion of Super-Villains. |
| School for Super-Villains | Adventure Comics #371 (August 1968) | A school for supervillains founded by Tarik the Mute. |
| Sklarian Raiders | Superboy and the Legion of Super-Heroes #233 (November 1977) | An all-female band of space pirates. |
| Spider Girl | Adventure Comics #310 (July 1963) | A rejected Legionnaire applicant and member of the Legion of Super-Villains who possesses prehensile hair. |
| Starfinger | Adventure Comics #335 (August 1965) | Originally, Starfinger is an alternate identity of Lightning Lad, who was mind-controlled by Dr. Lars Hanscom. Later, criminal Char Burrane and Lars' brother Molock Hanscom obtain a set of alien rings and take on the Starfinger mantle. |
| Storm Boy (Myke Chypurz) | Adventure Comics #301 (October 1962) | A member of the Legion of Super-Villains who was rejected from the Legion of Super-Heroes after they discovered that his weather-manipulating abilities are derived from a hidden device and are not natural. |
| Sun Emperor (Nigal Douglous) | Superboy #208 (April 1975) | A criminal and member of the Legion of Super-Villains who gained the ability to manipulate solar energy after participating in a genetic experiment. |
| Superboy-Prime | DC Comics Presents #87 (November 1985) | An alternate universe variant of Superman who battles the Legion after being sent to the 31st century by the Time Trapper, who is later revealed to be his future self. |
| Tarik the Mute (Benno Tarik) | Adventure Comics #372 (September 1968) | A civilian who was injured and rendered mute during a battle between the Science Police and a group of criminals. Subsequently, Tarik seeks revenge against the law and forms the School for Super-Villains. |
| Time Trapper | Adventure Comics #317 (February 1964) | A powerful, time-manipulating entity who resides at the end of time. Because of his ever-changing nature, he has had several identities, including his assistant Glorith, a Controller, Cosmic Boy, the young girl Lori Morning, and Superboy-Prime. |
| Tyr | Superboy #197 (September 1973) | An alien from the planet Tyrraz and a member of the Legion of Super-Villains. He wields a bionic gun in place of his right arm. |
| Universo | Adventure Comics #349 (October 1966) | A former Green Lantern who was stripped of his power ring after attempting to view the beginning of the universe. |
| Vandal Savage | Green Lantern #10 (Winter 1943) | A Cro-Magnon who gained immortality after being exposed to a radioactive meteor. He has battled various heroes, including the Legion of Super-Heroes. |
| White Triangle | Legion of Super-Heroes (vol. 4) #66 (March 1995) | A xenophobic group of Daxamites who view other races as inferior and plot to destroy the United Planets due to its goal of uniting different races. |
| Workforce | Legion of Super-Heroes (vol. 4) #64 (January 1995) | A group of superpowered youths formed by Leland McCauley to rival his enemy R. J. Brande's Legion of Super-Heroes. The Workforce members later abandon McCauley to become real heroes. |
