Gravity Girl is a Princess of the planet Gravitas, daughter to its King. She was entitled to a life of privilege but left her home planet to join the Space Patrol. Once she passed on from cadet to galactic trooper, she was paired up with Vapor Man and Meteor Man. Gravity Girl and the Galaxy Trio would come into conflict with various galactic-based criminals and would save the day of many of the outer worlds.
Her superpowers allow her to psionically alter the gravitational field around a person or object. She can negate its gravity and allow it to fly, an option she uses on herself. Or increase its gravity to the point the object is immovable. Her signature move is doing this to opponents, sending them hurtling into the sky and off into the distance or pinning them to the ground and taking them out of a battle.