Dori Aandraison is from the planet Xolnar in the 30th-Century, Dori hoped to become a Legionnaire as a stepping stone towards a career as a holovid actress. She won a trip to Metropolis where Legion of Super-Heroes tryout were being held by using her powers in the "Miss Xolnar" contest. Rainbow Girl's powers gave her a heightened pheromonic field which made her personality irresistable to everyone while surrounding her in a corruscating field of light resembling a rainbow. Unfortunately, she did not gain Legion membership. Rather than returning to Xolnar, she married Irveang Polamar, a member of one of the oldest and wealthiest families in Metropolis, so she could remain on Earth.