Allison was taken to Science City Zero in 1950 as part of a government project to test the limits of the human body and bio-engineering. She was shot by a firing squad and then resurrected by Randall Dowling by use of atomic radiation.

The treatment returned her to life and stopped her aging, but only gave her a "half-life" of fifty years. In 2000 she died, but not before leading *Planetary* to the remains of Science City Zero and imploring them to use its secrets to stop Dowling and his associates.