James Gunn, co-head of DC Studios, has shared a behind-the-scenes photo of Milly Alcock preparing for her ... everything changes. An alien girl seeks her out for a vicious mission.

Milly Alcock is all set to wear the Supergirl cape ... who is accompanied by Ruthye, a young alien girl seeking vengeance after her father's death at the hands of Krem of the Yellow Hills.