Borg drone who left the Collective and joined the crew of the Federation Starship Voyager in early 2374. Seven of Nine, who was Tertiary Adjunct of Unimatrix Zero One, was born a human female named Annika Hansen in 2348. Annika's parents were noted scientists who were last seen in the Omega Sector in 2356, having departed from station Deep Space 4 aboard the science vessel Raven on an expedition of the Delta Quadrant. The Raven encountered a Borg ship in B'omar space and crashed on a Class-M moon. Annika's parents were killed by the Borg in the incident, and Annika was assimilated at the age of six. Seven of Nine was assigned as Borg liaison to Starfleet Captain Kathryn Janeway in early 2374 when the Collective formed an uneasy alliance with Janeway to defeat species 8472. Seven was the only drone from her cube to survive the encounter that saw her ship destroyed, and all of her remaining shipmates killed when they attempted to assimilate Voyager. Thus separated from the Collective, Seven's human physiology reasserted itself, and Voyager personnel removed most of Seven's Borg implants to increase her chances of survival. The use of dermaplastic grafts and follicle stimulation even gave her a nearly normal human appearance. Having spent nearly her entire life as a Borg drone, Seven of Nine did not consider herself to be a human. She objected strongly to losing her Borg identity against her will. Her Voyager shipmates, including Captain Janeway, were nevertheless committed to helping her make what proved to be a difficult return to human society.