Molly Wilson is a young librarian who is transformed into Thunder Girl by shouting the magic word, "Alakazam!".

During the Criss-Cross Crisis, Thunder Girl discovered that her arch-foe, Dr. Hy Q. Binana (a super-intelligent monkey) was behind the clash of two worlds, but when the Crisis was over, Thunder Girl was trapped on the Silver Age Earth-A, unable to return home to the Golden Age Earth-B.

The primary power that she possesses is the ability to transform into her superpowered alter ego by saying the word "Alakazam" loudly.

She also possesses the "Wisdom of the Owl" which grants her a form of enhanced intellect, presumably heightening her memory and ability to process information.

In addition, Molly is capable of using her transformative lightning bolts as unconventional weapons to strike opponents.