Supergirl Head No. 2, so dubbed by Supergirl, was a second head grown by Supergirl following an encounter with Red Kryptonite. The second head had none of Kara's memories and had a distinct personality, with no memories before forming on Kara's body. Kara explained the situation to her second head, and the two explored the Midvale fair before stopping a number of natural disasters together. When the effects of the Red K wore off, she begged Supergirl for help before she disappeared, her existence ended. Supergirl lamented the loss of what felt like a sister. ("The Strange Bodies of Supergirl!")
- Everything's -- blurring! Supergirl no. 1... save me! Help me!
- -Supergirl Head No. 2, final words.