The Flash

A woman with long hair, wearing a corset and jacket, stands in a dark room, holding two batons and moving them in a circular motion. The scene cuts to a group of costumed heroes walking forward, then to a woman in a Supergirl suit, followed by a group of heroes flying at night toward a building with a "STAR LABORATORIES" sign, and finally to a woman standing in a dark outdoor area with a glowing white arc shape appearing around her.