When Superman's native planet was destroyed, pieces of it became irradiated by the explosion, the result is Kryptonite. Contact with, or even proximity to Kryptonite can cause injury or death to Kryptonians.
Black kryptonite split Supergirl into a good Kara and an evil Kara for a while, until Wonder Woman used her Lasso of Truth to merge the two. And don't pay any attention to BlackFlash.
" Black kryptonite split Supergirl into a good Kara and an evil Kara for a while, until Wonder Woman used her Lasso of Truth to merge the two.And don't pay any attention to BlackFlash. "
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