Supergirl #4

Dark Supergirl confronts Luthor. They fight, and Luthor flees after she destroys his glove. She flings him into the Watchtower on the moon, where he is confronted by Green Lantern. Dark Supergirl catches up, takes Green Lantern’s ring, and uses it to knock him out. Meanwhile, Starfire awakens Supergirl, and she seeks out Dark Supergirl. Back in the Watchtower, Luthor uses the JLA transporter to go back to Earth, as Hawkman tries to stop him. After defeating Hawkman, Black Canary, Flash, and Martian Manhunter, Dark Supergirl is confronted by Supergirl.

Plot details indexed by the Grand Comics Database (CC BY-SA).