On Earth, to most of her friends and family, Betty Barrett is a typical yet cute and tomboyishly beautiful 12 year old schoolgirl who is highly athletic and loves almost every sport she tries. She also enjoys visiting her grandmother, singing in her band, and hanging out with her friends. In addition to her cuteness and beauty, she is not afraid to speak her mind either and dislikes any form of bullying, snobbery and injustice. However, when there is trouble in deep space, she captains her own starcruiser as the main protagonist Atomic Betty, a Galactic Guardian and defender of the cosmos. In space, she investigates crimes and fights evil. She can easily defend herself as an expert hand-to-hand fighter, but is also equipped with Galactic Guardian-issued bracelet, housing a communications device and remote controls for her ship and its teleporter, as well as an array of gadgets and weapons.
Betty had been the only one to object to Galactic Guardian Headquarters moving to Earth and to her hometown, having preferred another planet (or even an isolated location on Earth). In Mission: Earth, she has become more commanding in her Galactic Guardian duties, due to the stresses involved with Galactic Guardian Headquarters having moved to her hometown, the increased involvement of her spaceship crew in her daily life, her budding romance and the fact that an increasing number of villains have targeted Earth.
Betty's appearence also changed into her 16 year-old version due to unknown event that involved a disruption energy wave constantly changing from an unpredictable timeline storm caused by the Orgs.
She also leading a team group specialize expert and fighting female unit for a intense mission to call for.