Emerging from the Phantom Zone through a mirror, Supergirl regains her powers and confronts Selena, who uses the Omegahedron to summon a gigantic shadow demon. The demon is on the verge of defeating Supergirl when she hears Zaltar's voice urging her to fight on. Supergirl breaks free and Nigel tells her the only way to defeat Selena is to turn the demon against her. Supergirl complies and creates a focused whirlwind that traps Selena, who is then attacked and incapacitated by the demon as the whirlwind pulls in Bianca as well. The three are sucked through the mirror portal, which promptly reforms, trapping them all forever. Free from Selena's spell, Ethan admits his love for Linda, knowing she and Supergirl are one-and-the same. He also understands she must save Argo City and that he may not see her again. The final scene shows Kara returning the Omegahedron to a darkened Argo City, which then lights up again.