Red Kryptonite Turns Kara Into a Villain For Supergirl's Best Episode Yet

Red Kryptonite arrived in National City on Monday night. It turns out, the diabolical creation of Maxwell Lord (Peter Facinelli) was actually a weapon for making the best episode ofSupergirl yet.

Kara (Melissa Benoist) becomes infected with the synthetic Kryptonite substance while assisting a

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