While working on a story for the Liberty City Online News Channel on recent abductions in the city, news reporter Ashley Kelly was captured by an alien race called The Protectors.
Aboard their ship, Ashley was placed through a series of physical trials, each time challenged to denounce the human race in order to spare the Earth from destruction. With each refusal, The Protectors progressively challenged the resolve of their captive. Knowing that sparing Earth would instead lead to enslavement, Ashley grew increasingly defiant.
When one final test failed to get the captive news reporter to submit, The Protectors freed Ashley — revealing that all previous abductees had faced the same tests, and she was the only one who refused to yield.
Having proved worthy, Ashley was granted a golden power belt from their planet Ultrania. Donning a red, blue and gold costume to conceal her identity, Ashley became Liberty City's protector: UltraGirl.
Recent events have confirmed the existence of the multiverse — parallel universes at different vibrational frequencies. Each universe has their own Earth. Each has their own UltraGirl.
UltraGirl's powers are fueled entirely by her ultranium power belt. Without it, she becomes powerless. In rare cases, residual energy can sustain partial power for a short time after removal. Once contact is restored, her powers return in a slow, steady surge.