Lioness, whose real name is Lorena Burgos, is a South American metahuman (catlike athletic) and an agent of the Mandelovian Security Corps. She was tall, had dark skin and black eyes, and wore a black leather suit.
Burgos grew up in an undisclosed South American nation. She trained in the U.S. to become a member of the Metagene Cover and Control Agency (MCCA). While there, she met Ritchie Stevens, who became Special Agent Turner of the MCCA and who introduced her to his friend, Patrick Walker, who was secretly an MCCA agent using this false identity. She began dating Walker and soon became pregnant, giving birth to a son named Daniel Walker. When she learned she was a metahuman, she left the program and fled for Mandelovia, which accepted metahumans at the time. Walker kept custody of Daniel because of her outlaw status, and she later learned that Walker died in the line of duty as an MCCA agent and that Daniel had died under mysterious circumstances, but she was never able to confirm these apparent facts.
She was later recruited into the Mandelovian Security Corps, where she was given the code name Lioness. There she met Agent F7, a shapechanging MSC agent from the United Kingdom who became her partner and lover. She and Agent F7 liaised with Malvan-X Corporation, where they worked with Dr. Henry Quantos, head of research.
In September, 2001, Lioness and Agent F7 were assigned to rescue Edulcore Cicciotto from Turner, who had been sent to capture him. They brought him to Malvan-X, where Quantos told Cicciotto that he had an Alpha Class metagene.