The episode ended before we could find out what it is, exactly, the second Kara is doing or what she's trying to get to, but that doesn't mean we're completely in the dark. At first, it seemed like it was a random incident, but there was actually good reason for the bridge's fall: Below where it used to stand, the second Kara was using her super strength to tunnel into something deep underground, unintentionally (or maybe intentionally) making it structurally unsound. This particular scene started after a bridge collapsed in Kaznia, and Supergirl raced to save a train full of passengers. So, this is only the second time viewers have seen her. The second Kara was first introduced at the end of Season 3, when an aura left Supergirl’s body during her battle with Reign. Chief among them: What is the second Kara doing that warranted her punching her way through rocks underground? She's definitely a woman on a mission, but to what end? The final moments of the episode, however, brought up several questions.
From catching an art thief to stopping a train from plummeting off a crumbling bridge in Kaznia, Kara proved to be just as heroic as ever. The Season 4 premiere of Supergirl kicked things off in the usual fashion: with the Girl of Steel saving the day not just in National City, but all over the world. Spoilers ahead for the Supergirl Season 4 premiere.
