Leslie was one of five children exposed to extradimensional Bio-Power when aliens entered our reality to escape their evil captors. Her exposure resulted in her developing the power to create psychokinetic force-fields. As a teenager, her powers soon began to grow beyond her control, so she was treated by Dr. Haverson and equipped with a Bionic Morpher that contained Leslie's power. When evil aliens came to re-capture the first aliens to arrive, Leslie was able to use her Morpher to become the Pink Ranger and teamed up with the other four exposed kids to become the Power Rangers Bionic!