Posted in: DC Universe, TV | Tagged: Black Kryptonite, cw, entertainment, melissa benoist, smallville, supergirl, television

Supergirl Season 3: What is Black Kryptonite

Turns out that the Black Rock of Utica that Kara (Melissa Benoist) and Mon-El (Chris Wood) went off into space to get is now being called black kryptonite. The history of black kryptonite is rather interesting in that it made it's first debut in an episode of Smallville. It was used to split Clark (Tom Welling) in two during the fourth season when he had been "reprogrammed" to be just Kal-El. It showed up again in season eight of the series and separated Doomsday from his human counterpart, Davis Bloome (Sam Witwer). But Bloome still ended up killing Jimmy Olsen on his own. It would later find it's way into the comics where it effects Kryptonians by splitting them in two, one half good while the other is evil. Both Superman and Supergirl have had to face their evil halves. This effect though can be tied back to the film Superman III where Gus Gorman's efforts to replicate kryptonite by adding nicotine as the mystery ingredient lead to it splitting Superman into two, good and evil. It wasn't called black kryptonite in the film.

In the comics black kryptonite is a varietal of kryptonite made by heating green kryptonite to extreme temperatures.

In Supergirl, the substance appears to be more rare and is currently fueling the shield that protects Argo City.  We saw that it was part of the ritual to bind / create a Worldkiller and we saw that Supergirl lost control of her heat vision after touching the stone. Lena (Katie McGrath) believes she can use the stone to split Sam (Odette Annable) from Reign. But what happens to Reign when they are separated? And is this a good thing?

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