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The Black Mercy is a telepathic species. It reads the heart's desires and feeds the individuals a totally convincing simulation of it.
~ Mongul about the Black Mercy plants.

The Black Mercy is a telepathic and parastitic plant-like alien species. It was capable of attaching itself to a host, read the host's memories, then feed the host a totally convincing simulated reality that was based on the host's deepest personal desires. What the Black Mercy received in return for this state is unknown.



This plant Ater Clemtia is also known as the Black Mercy.

The Black Mercy was a species of parasitic plant that were native to a world in Space Sector 2811. Its origin was traced to being the empathic offspring of the living planet known as Mother Mercy and was seeded by her upon maturity whereupon it was sent into the stars on a mission to alleviate the pain and suffering felt by the sick or by the dying.


At some point, the tyrant Mongul I discovered the home planet of the Black Mercy plant whereupon he began harvesting it for a more sinister purpose. Twisting the creature, he intended for the plant to be a killing tool and thus distorted their true original purpose by making it infect healthy hosts whereupon they slowly began destroying their victims. At the time of his harvest, Mother Mercy decided not to reveal her true nature and simply allowed the supervillain to continue upon his goal. He used the plant in his battles against Superman and the Justice League until he stopped coming as a result of his death. However, in time, his son came to the world and continued his father's usage of the Black Mercy plant. Mongul II later travelled to the planet Earth in order to accomplish his deceased father's wishes of conquering that world. With him, he brought a number of Black Mercy plant which infected animals and beings in a farm on the planet. Hal Jordan and Green Arrow after arriving in the field discovered a large number of Black Mercy plant which had infected the cows in the region. Mongul II ensured that the plant had plenty of water and "food" by allowing them to infest the native Humans in the region. During a fight with Mongul II, Hal Jordan attempted to burn the Black Mercy plant but during the skirmish both him and Green Arrow where infected by the creatures who made them live in a dream-like state.

Sinestro Corps

After the Sinestro Corps War, Mongul II discovered a Qwardian Power Ring whereupon he became a powerful member within the leaderless Sinestro Corps. Using his new power ring, he genetically altered a number of Black Mercy plant which transformed them from weaving dreams within its hosts to making them instilling great fear on their victims. Black Mercy was used against a number of members of the Green Lantern Corps which were investigating Mongul II's operations where it infected Sodam Yat and Arisia.

Powers and Abilities

  • Parasiticism : it had the capacity of feeding of the bioelectrical aura of a host organism until it died. It accomplished this feat by attaching to its prey with the main roots that consisted of needle-like vines which entered the skin of the host whereupon it fused with the nervous system. They left the host in a state of euphoria whereupon the plants slowly killed the host as it fed from the feelings generated by its victims.
    • Dream Worlds: after infecting a host and wrapping their tendrils onto them, the plant began altering the visual perceptions of its victim leaving them in a dream-like state where their fondest desires as well as wishes came true. This left them trapped within their own bodies which were in a near vegetative state whilst the plant began to slowly feed off their dreams until the hosts died.
    • Nightmares: when they were manipulated by a Qwardian Power Ring's fear energy which distorted their natural talents, the plant was changed with a new ability of making their hosts live in a nightmare state where their deepest as well as darkest fears came into reality. Victims latched onto by this brand of mercy suffer their most dreaded horrors untill they expire from the plants leeching effects.

Dream Worlds

The Black Mercy plant is capable of creating "dream worlds", each faux utopian realities that are a complete and utterly convincing simulation of the victims' deepest desires, be it wanting to be very rich and famous, longing for a family or becoming either a hero or a ruler. There are known victims whose "perfect worlds" are the taste of the psychic and parastitic powers of the Black Mercy.

  • Superman: in this simulated alternate reality, his father Jor-El's prediction was proven untrue. He is married to Loana, a beautiful Kryptonian woman who is a composite of Lois Lane and Lana Lang, and together they has two children including their son Van-El. In the midst of this, Krypton is going into politcal upheaval. His cousin Supergirl (who  in this version was not older than him; in current canon, shewould be almost 16 years older than him by that point) is attacked by anti-Phantom Zone protesters.
  • Batman: In this dream, young Bruce Wayne's parents' murder is foiled. He grows up and has a wife named Kathy Kane, and together they both have a daughter.
  • Mongul: In this nightmarish dream, Mongu himself kills the people he is fighting—Wonder Woman, Superman, Robin, and Batman—and goes on to conquer the entire cosmos.
  • Green Lantern: In this dream, Hal Jordan's father never died nor did his mother. Coast City was never destroyed. Sinestro never turned evil, and is his mentor and friend. They show the Green Lantern Corps fighting an unknown man possessed by Parallax. His family is together happy and he is dating his high school sweetheart Jen.
  • Green Arrow: in this dream, Ollie is married to Sandra Hawke and has a great relationship with his son Conner. He has at least 3 kids. His son Connor Hawke was Speedy or the equavilant of it. His identity is publicly known.


The worlds are temporary and people always break free. Either the plant loses its grip, or the people under its thrall may realize it is never their lives or life is never this perfect. It is possible it does not work because desires are empty.



  • The Black Mercy plant in Justice League Unlimited.

    The Black Mercy plant appears in the Justice League Unlimited episode "For The Man Who Has Everything", which is based on the Superman Annual volume 1 story of the same name.
  • In the DC Comics, the Black Mercy was used by Mongul as part of his revenge against Superman for ruining his chances to obtain War World. Following the Crisis on Infinite Earths, the Black Mercy plant was retconned to be a symbiotic species created by Mother Mercy, a sentient plant organism, and were intended to latch to terminally ill sentients and give them a happy, painless death. Mongul's son, Mongul the Lesser, later used several in a plan to kill his sister Mongal.
  • The Red Mercy.

    In the Superboy comic books, there exists the Red Mercy,  a possible variation of the Black Mercy plant species. Unlike most typical and altered Black Mercy plants which grant their hosts a perfected dellussion or an unending horror show. These Red Mercies place the host in a what if scenario where events in their lives took a turn in the absolute worst direction imaginable, not simply taking an idnividuals worst fears and making them come alive. But putting them behind the drivers seat of the most ugly, despicable stances which the individual dreamers destiny could possibly take them.


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Theatrical Movies
Superman: Lex Luthor | Otis | Eve Teschmacher | General Zod | Non | Ursa
Superman II: General Zod | Non | Ursa | Lex Luthor | Otis | Eve Teschmacher | Rocky
Superman III: Ross Webster | Corrupted Superman | Vera Webster | Lorelei Ambrosia | Gus Gorman
Superman IV: The Quest for Peace: Lex Luthor | Nuclear Man
Superman Returns: Lex Luthor
Man of Steel: Sword of Rao (Dru-Zod, Faora-Ul, Nam-Ek, Jax-Ur, Tor-An, Car-Vex, Nadira, & Dev-Em II)
Batman v Superman: Dawn of Justice: Lex Luthor | Doomsday | Anatoli Knyazev | Mercy Graves | Cesar Santos | Amajagh | Joe Chill | Zod | Steppenwolf
DC League of Super-Pets: Lulu | Lex Luthor | Mercy Graves | Whiskers

Direct-to-video Movies
Superman: Brainiac Attacks: Brainiac | Lex Luthor | Mercy Graves | Mister Mxyzptlk
Superman: Doomsday: Lex Luthor | Superman Clone | Doomsday | Toyman | Mercy Graves
Superman/Batman: Public Enemies: Lex Luthor | Major Force | Metallo | Amanda Waller | Toyman | Solomon Grundy | Gorilla Grodd | Killer Frost | Lady Shiva | Giganta | Mongul | Captain Cold
Superman/Batman: Apocalypse: Darkseid | Female Furies (Granny Goodness, Gilotina, Mad Harriet, Lashina & Stompa) | Doomsday
Superman/Shazam!: The Return of Black Adam: Black Adam
All-Star Superman: Lex Luthor | Solaris | Parasite | Nasthalthia Luthor | Bar-El & Lilo-El
Superman vs. The Elite: The Elite (Manchester Black, Coldcast, Menagerie & Hat) | Atomic Skull
Superman: Unbound: Brainiac
The Death Of Superman: Doomsday | Lex Luthor | Intergang (Bruno Mannheim) | Mercy Graves | Cyborg Superman
Reign Of The Supermen: Cyborg Superman | Darkseid | Parademons | Lex Luthor | Mercy Graves
Superman: Red Son: Superman | Brainiac | Lex Luthor | Batman | Superior Man
Superman: Man of Tomorrow: Parasite | Lobo | Lex Luthor

1940's Superman
Bulleteers | Inventor | Mechanical Monsters | Mad Scientist | Indian Scientist

Superman: The Animated Series
Lex Luthor | Brainiac | Darkseid | Metallo | Toyman | Intergang (Bruno Mannheim, Spider Spinelli, & Blaine) | Mercy Graves | Joey | Parasite | Dr. Vale | Lobo | Gnaww | Preserver | Kanto | Earl Garver | Jax-Ur | Mala | Prometheon | General Hardcastle | Weather Wizard | Livewire | Bizarro | Kurt Bowman | Luminus | Mister Mxyzptlk | Superman (Brave New Metropolis) | Lex Luthor (Brave New Metropolis) | Titano | Desaad | Kalibak | Joker | Harley Quinn | Karkull | Corey Mills | Suit | Maxima | De'Cine | Steppenwolf | Parademons | Female Furies (Granny Goodness, Stompa, Mad Harriet, & Lashina) | Volcana | Kurt | Starro | Roxy Rocket | Penguin | Bane | Riddler | Mad Hatter | Darci Mason | Sinestro | Unity | Reverend Amos Howell | Society of Shadows (Ra's al Ghul, Talia al Ghul, & Ubu)

Brainiac | Zod | Doomsday | Lobo | Jax-Ur | Kol-Da | Lis-Ser | Daron-Vex | Araame | Lyta-Zod Clone

Superman & Lois
Tal-Rho | John Henry Irons | Leslie Larr | Mitch Anderson | Bizarro | Zeta-Rho | Superman (John Henry Irons' Earth) | Reno Rosetti | David Fuglestad | Atom-Man | Zod | Phillip Karnowsky | Kit Faulkner | Inverse Society (Ally Allston, Lana-Rho, Jonathan-El, & Erin Wu) | Intergang (Thaddeus Killgrave)

Video Games
Superman Arcade: Emperor Zaas | Lex Luthor | Metallo | Parasite
Superman: Shadow of Apokolips: Lex Luthor | Darkseid | Metallo | Livewire | Parasite | Kanto | Mercy Graves | Volcana
Mortal Kombat vs. DC Universe: Dark Kahn | Lex Luthor | Scorpion | Shang Tsung | Darkseid
Injustice: Superman | Brainiac | Doomsday | Aquaman | Black Adam | Sinestro | Lex Luthor | Joker | Darkseid

See Also
Legion of Super-Heroes Villains | Lobo Villains | Smallville Villains | Steel Villains | Superboy Villains | Supergirl Villains | Superwoman Villains

           Green Lantern logo.png Villains

Alex Luthor | Amon Sur | Anti-Green Lantern Corps | Anti-Monitor | Arkillo | Atrocitus | Ausras and Dismas | Barbatos | Bedovian | Black Hand | Black Lantern Corps | Black Mercies | Blackbriar Thorn | Blackguard | Bleez | Bolphunga | The Butcher | Carol Ferris | Controllers | Crumbler | Cyborg Superman | Dark Knights | Deacon Blackfire | Demiurge | Demolition Team | Despotellis | Dex-Starr | Doctor Light | Doctor Polaris | Doctor Ub’x | Dominators | Earthworm | Eclipso | Entropy | Evil Star | Fatality | First Lantern | Gambler | Glomulus | Goldface | Grayven | Gretti | Guardians of the Universe | Harlequin | Hector Hammond | Hellgrammite | Icicle | Invisible Destroyer | Javelin | Johnny Sorrow | Kanjar-Ro | Karu-Sil | Kobra Cult | Kroloteans | Krona | Kryb | Ku Klux Klan | Larfleeze | Legion | Lyssa Drak | Maash | Major Disaster | Major Force | Manhunter Highmaster | Manhunters | Maxwell Lord | Mister Freeze | Mongul | Mongul II | Mother Mercy | Multiplex | Nekron | Nero | Neron | Obsidian | Ohm | OMACs | Orange Lantern Corps | Parallax | Power Ring | Power Ring Corps | Professor Ojo | Psimon | Puppeteer | Purgatory | Queen of Fables | Ravager (Grant Wilson) | Ranx the Sentient City | Red Lantern Corps | Relic | Scar | Shark | Schlagg-Man | Shrapnel | Simon Stagg | Sinestro | Sinestro Corps | Slapper Soames | Solomon Grundy | Sonar | Spider Guild | Sportsmaster | Star Sapphire | Starbreaker | Steamroller | Suit | Superboy-Prime | Tattooed Man | The Dawnbreaker | The Third Army | Thorn | Time Commander | Typhoon | Vandal Savage | Void Hound | Warlock of Ys | Weaponers of Qward | Weasel | Wizard | Wotan | Zamarons

Green Lantern: First Flight: Sinestro | Boodikka | Kanjar-Ro
Green Lantern: Emerald Knights: Krona | Atrocitus | Bolphunga
Green Lantern (2011): Parallax | Hector Hammond
Green Lantern: Beware My Power: Parallax | Sinestro Corps (Sinestro, Arkillo, Despero, Lyssa Drak) | Kanjar-Ro

Green Lantern: The Animated Series: Atrocitus | Razer | Aya | Anti-Monitor

Video Games
Mortal Kombat vs. DC Universe: Dark Kahn | Shang Tsung | Lex Luthor
Green Lantern: Rise of the Manhunters: Amon Sur | Manhunters
Injustice: Superman | Sinestro | Cyborg | Raven | Solomon Grundy | Killer Frost | Yellow Lantern | Black Adam | Aquaman | Cheetah | Bane | Atrocitus