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"It can separate the beast from the man."
Clark to Chloe, Doomsday

Black Kryptonite/Black meteor rock is a form of refined Kryptonite that can separate a single person/being physically and spiritually with a persona and a personality into two separate people/beings with two personas and two personalities. This Kryptonite is created by heating Green Kryptonite to extremely high temperatures. It may change the Kryptonian's eye color, like Red Kryptonite and Blue Kryptonite, due the fact that Lois checked Clark's eyes to see if he was under the influence of Red Kryptonite. It's unclear what would happen if other forms of Kryptonite were heated to the same degree, if anything.

Known Uses[]

Black Kryptonite has been used to split several people/beings physically and spiritually into different people/beings: one good and one evil, one light and one dark, one free and one controlled, one tame and one ferocious, one human and one monster.

  • Bridgette Crosby having the Black Kryptonite and knowing what it does suggests it was used on a Kryptonian before.
  • Jor-El transformed Clark into Kal-El in black and purple light, implying he used Black Kryptonite on Clark to do it.
  • Clark reborn

    Jor-El possibly using Black Kryptonite on Clark.

    Martha Kent used it to split Kal-El from Clark. Clark slammed Black Kryptonite against Kal-El's chest. The two entities appeared to combine into a single person/being; it's unclear if Kal-El was killed, or if Clark now controlled the re-combined person/being.
  • Lex Luthor was split by Black Kryptonite into a good Lex and an evil Lex. Clark used his heat vision to turn the Green Kryptonite gem of evil Lex's Green Kryptonite ring into a Black Kryptonite gem which combined the half-light and half-dark Lexes back together.
  • Chloe Sullivan used Black Kryptonite to divide the transforming Davis Bloome into a humanoid Davis and his rampaging monster counterpart, Doomsday. The two sides of Davis were never re-combined; Doomsday was eventually buried down a geothermal facility and Davis Bloome was killed by a dying Jimmy Olsen.
  • Tess Mercer - She had a black meteor rock in her vault, its unknown if she made it or if she used it.

Properties[]

401Smallville0943

Black Kryptonite causing the effect.

The full potential of Black Kryptonite is unknown, but it seems to have the ability to literally separate humans and Kryptonians physically and spiritually with personas and personalities including the genetic fusion of the monster Doomsday and the humanoid Davis Bloome.

Good Kryptonians and metahumans with personas and personalities seemed to be less powerful than the evil ones, although this might simply be due to the lack of restraint. Kal-El showed this when he overpowered Clark Kent. It is unknown if their good halves still had their powers or not, although Clark was able to slam the Black Kryptonite against Kal-El's chest to cause them both to merge back together in order for Clark to take over.

It seems Black Kryptonite affects Kryptonians in any state; yet to affect a human, it must be freshly heated, as Lex Luthor was separated into two beings by heated Black Kryptonite immediately after it reached critical temperature, while, in contrast, Martha Kent, Chloe Sullivan, Bart Allen and Oliver Queen were unaffected at room temperature.

Onyx1

Lex is exposed to a Black Kryptonite and split in two.

Although Black Kryptonite can separate a human physically with a persona and a personality into two separate bodies, it is not known what happens to the second person/being with a persona and a personality if its counterpart dies. However, one body can sustain injuries while the counterpart remains unaffected, which suggests that the death of one body would not cause the death of another. Also, Kryptonians can survive if separated and one of the halves with a persona and a personality is killed.

Like any other form of Kryptonite, its effects and influence can be supressed by lead or objects with lead properties if the lead is larger than the fragment of Black Kryptonite. It's unknown if Black Kryptonite remains intact after using it, seeing as it's never shown after separating the good and evil parts of the individual, so it's possible the amount the energy released to cause the separation destroys the Black Kryptonite.

Season Four[]

Crusade571

Martha holds a Black Kryptonite to Clark.

Black Kryptonite was discovered and/or manufactured by Dr. Virgil Swann, who gave it to his associate Dr. Bridgette Crosby who, in turn, gave it to Martha Kent to help her after Clark Kent was re-programmed as Kal-El by Jor-El in an attempt to force him to fulfill his destiny.

Black K

Lex Luthor accidentally creates a Black Kryptonite.

Martha used a chunk of Black Kryptonite to separate Kal-El from Clark. In the subsequent confrontation, Clark slammed a chunk of Black Kryptonite against Kal-El's chest to cause them both to merge together in order for Clark to take over. When placed near Clark's possessed body, Black Kryptonite shone a very bright electrical blue.

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Black Kryptonite merged the two versions of Lex back into one.

Lex Luthor accidentally created Black Kryptonite from Green Kryptonite during an experiment by heating it to a very high temperature using a laser. This caused an explosion, and the stone separated Lex into two different entities: One was the good Lex, but the other his evil side Alexander, who imprisoned Lex and, having discovered Clark's secret, attempted to blackmail him into helping him conquer Earth by use of a Kryptonite ring and threatening to kill Lana Lang.

Fortunately, Clark was able to turn the Green Kryptonite gem of Alexander's Green Kryptonite ring into Black Kryptonite gem using heat vision. The resultant Black Kryptonite gem merged the two versions of Lex back into one body, with Lex apparently retaining no memory of Alexander's actions.

Season Eight[]

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Chloe using Black Kryptonite on Davis.

Four years later, Clark asked Oliver Queen to steal some Black Kryptonite from the Luthor Mansion, as he thought Tess Mercer had some from Lex's research. Oliver, as Green Arrow, broke into the mansion, knocking out Tess's assistant and stealing the Black Kryptonite from Tess's bedroom safe using her duplicated fingerprint.

S08e22 (4)

Davis and Doomsday begin to separate.

The next day, Clark met Oliver at LuthorCorp, where Clark received the Black Kryptonite from Oliver and explained that he planned on using Black Kryptonite to separate Davis Bloome from Doomsday, and sending the latter into the Phantom Zone. Clark then stored the Black Kryptonite away in his barn. When the Justice League captured both Davis and Chloe Sullivan, and Doomsday was about to emerge, Chloe used the Black Kryptonite that they took from Clark to separate the beast from Davis.

Appearances[]

Notes[]

  • The effects of Black Kryptonite seem similar to the effects of synthetic Kryptonite in Superman III, where they split the evil Superman from the movie's main protagonist Clark Kent.
  • Black kryptonite was originally thought to be able to separate the good sides from the evil sides of humans and Kryptonians with personas and personalities. However, Davis had been trying to battle his evil side for so long by murdering people in his human form that, when split by a Black Kryptonite, both sides of him turned out to be evil, as he killed Jimmy Olsen.
  • In Season 4, it was ambiguous if killing one half of someone separated by Black Kryptonite would also end the life of the surviving half. In Season 8 this was indirectly answered, as Doomsday (a being that still exists in the Superman universe) was separated with a Black Kryptonite, and the half that was mostly Davis died (Although this may have been due to Doomsday's unique nature allowing him to 'evolve' beyond the point where he 'needed' Davis rather than a definite example of a Black Kryptonite's effects).
  • In the Arrowverse show Supergirl, Black Kryptonite is used to give people extraordinary powers and create the “Worldkillers”.
  • In Witness, Eric Marsh and his gang heated up Green Kryptonite in a blast furnace, without it turning into Black Kryptonite. The only things shown to be hot enough to make the change are Heat Vision and LuthorCorp lasers.
  • It's unknown what would happen if Black Kryptonite was used on a Kryptonian vessel, whether or not it would separate them into four beings (the vessel and his evil side, and the Kryptonian and his evil side), same question goes for a Kryptonian hybrid.

In the Comics[]

  • DC Comics Black Kryptonite

    Black Kryptonite in The DC Comics comicbooks

    A Black Kryptonite made its official debut into the DC Universe in September 2005's Supergirl #2, where it apparently possessed the ability to split a person or a person's personality into two separate entities. In Supergirl #3, Lex Luthor used a Black Kryptonite on Supergirl, which caused her to split into two separate people, one wearing Supergirl's traditional costume, and another wearing a black-and-white version. Her black-and-white costume is similar to the one that Superman was wearing when he returned from the dead. Luthor noted that he was given the Black Kryptonite by the New God Darkseid, who may have been responsible for its creation.
  • The Black Kryptonite gives off a purple color to it, and in the comics, there are multiple shades of purple kryptonite; there was dark purple Kryptonite, which was a more severe form of green kryptonite, and there was light purple Kryptonite which makes Superman absorb yellow sunlight faster.

See also[]

Kryptonite in Smallville
Types Natural: GreenRedBlueGold Kryptonite • Processed: BlackSilverGemstoneRefined
Effects Meteor infectionPsychosisMeteor freaks
Objects BulletCageHandcuffsHeartKeyRingKryptonite necklace (Necklace) • Victory ring
Other KryptonMeteor showers (1989, 2005, Earth-2), • Lead (box) • Appearances of Green K (usages)
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