'Supergirl' last left off with Lena Luthor learning her employee Sam was the Worldkiller, Reign. <br /><br />But some other secrets may cause friction with Lena and Kara.<br /><br />The show's co-showrunner Jessica Queller said it sets up a triangle between the friends that makes it "challenging" for Kara and her super identity.<br /><br />Lena has a very different relationship with Kara Danvers than she does with Supergirl... <br />
