If "Kryptonite" is ore from Krypton and Krypton was destroyed, then how did this ore come to earth in Batman v Superman: Dawn of Justice?

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    Just a side note, this is a fairly consistent question/issue throughout the entire Superman mythos - the idea that a planet lightyears away exploded and any of it hit Earth is questionable, and when you take into account the fact that every two-bit supervillian in the galaxy seems to have some (when it's convenient to the plot) it just gets ridiculous.
    – Tin Wizard
    Apr 12, 2016 at 20:04

3 Answers 3


In the film Batman V Superman: Dawn of Justice, the Kryptonite was evidently contained in the World Engine seen in the earlier installment; Man of Steel.

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As the latest film opens, we see some young children salvaging tech that's fallen outside the exclusion zone and selling it to various (Western) bidders on the beach. This apparently includes a clump of Kryptonite.

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  • I think Lex also mentioned that the kryptonite was contained within the device's reactor, but I unfortunately don't have the quote handy.
    – Liesmith
    Apr 12, 2016 at 10:04
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    A better question would be: If kryptonite comes from Krypton, and is lethal specifically to Kryptonians, how did their species ever evolve on a world chiefly composed of a substance that is inherently deadly to them? That never made sense to me. Apr 12, 2016 at 14:04
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    @ramb00 - It's not just that though. Kryptonite on Earth doesn't just make him normal mortal human strength - it weakens him so much he can't even stand up. (Though they're far from consistent about that - sometimes, he can pick up an entire island made of kryptonite and throw it into the sun - after being impaled through the chest by a spear made of kryptonite... This is why I don't like Superman in general - they can't even stick to their own rules.) Apr 12, 2016 at 14:50
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    @Richard no, it doesn't: Uranium is excluded from the iron/nickel core and is found in the mantle.
    – JDługosz
    Apr 12, 2016 at 19:41
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    @DarrelHoffman Superman's mythology has changed at random over the years, but the most reasonable explanation I've seen is that the explosion of Krypton was what actually rendered it radioactive.
    – Tin Wizard
    Apr 12, 2016 at 20:03

In the original Superman film, it was described as being from a meteorite:

The photo shows an ETHOPIAN FARMER holding a wedge-shaped green rock about a foot long and five inches high. The FARMER grins at the camera. The caption beneath reads: Meteorite Lands near Addis Ababa, Ethiopia, June, 1951.

EVE and OTIS stare at the picture, mystified.

EVE I know I'm going to get rapped in the mouth for saying this, but - so what?

LUTHOR So -what? You mean to us it's just a meteorite? Fair enough. . .

LUTHOR But because of its high level of specific radioactivity - to someone from the planet Krypton - this substance would be lethal!

The wiki provides some details on an overview of the explanation with regards to the comic books:

The amount of kryptonite shown to fall on the Earth in Silver Age stories is too large to have been evenly distributed from the explosion of any reasonably sized planet, so the usual explanation for the large amount that made it to Earth was that the kryptonite and other materials from Krypton were dragged to Earth by the experimental warp drive that brought Superman to Earth.


It was possible to artificially create green kryptonite, which the rogue genius Lex Luthor performed on various occasions. However, he rarely needed to do so, as kryptonite was so abundant that many ordinary criminals kept a supply as a precaution against Superman's interference.

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    It seems the OP meant Dawn of Justice, though.
    – Walt
    Apr 12, 2016 at 9:23
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    Wish OP had bothered to say that then before I wrote this. Apr 12, 2016 at 9:30
  • Yeah, it's why I asked, it seemed pretty straightforward in the original
    – Walt
    Apr 12, 2016 at 9:31
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    Yeah. There's so many different versions now, from movie to TV series to comic, it's hard to know where to start. Oh well! Apr 12, 2016 at 9:39
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    @AndrewMartin:really sorry
    – Dark Army
    Apr 12, 2016 at 10:13

It can be explained, but it is creating new ideas and accounts that were never revealed before. Superman's father put a very large chunk of Kryptonite in the spaceship that took Superman to earth. Kyptonite only became deadly to Superman in the Earth's atmosphere - and only after he had gone through puberty. The large chunk was stolen from Superman's earth parents' barn a few years after the spaceship crashed on Earth, and after the chunk was passed around within the underworld, it became apparent to some that the rock was deadly to him. The rock was broken up into many pieces, but it did not lose its potency.

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