
Earth-4 is the home of the superheroes who initially appeared in Charlton Comics such as Captain Atom, Blue Beetle, Peacemaker, and Nightshade. After Crisis on Infinite Earths this universe, as well as Earths 2, S, and X, combined with Earth 1 to create a New Earth.
The Earth-4 Supergirl is Bombshell. Captain Atom is most often seen as Earth-4’s Superman, and seeing that Amy Adams from New Earth underwent the same procedure that gave Captain Atom his powers it only makes sense for her to be Earth-4’s Supergirl. Bombshell (Amy Adams) is a member of the Teen Titans first appearing in Teen Titans #39 (2006) and had many appearances in that title until that book ended in 2011. She had a few other minor appearances but was usually only shown in team shots with the rest of the Teen Titans.
Amy Adams’ parents were part of Project Quantum and subjected her to the same Dilustel treatment that was given to both Captain Atom and Major Force. Her initial appearances showed her in an antagonistic role against the Titans. She was planted in the team as a traitor who would be revealed as such by Ravager. Later on in the Teen Titans run she would rejoin the team for real in an effort to redeem herself and attempt to become a hero.
As with all my Supergirl in the Multiverse posts, this is my own artwork and it depicts Bombshell on the left leaning against a wall with her arms crossed. In the background on the right is a computer screen reading “Project Quantum” and depicting my take on what Bombshell might have looked like if she had appeared in Charlton Comics alongside Captain Atom. A motif in the top right shows the Bombshell symbol and a 4 on top of it.

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