She was born on stardate 25479 in the Tendara Colony. At an age of about seven (in 2348), some 18 years prior to stardate 50984.3 (2373), Annika Hansen, then on board the deep space vessel 'Raven', was assimilated into the Borg collective. Before she came aboard Voyager, she served as Tertiary Adjunct to Uni-matrix 01 within the Borg Collective.

After Janeway severed her link with the collective, her human genes began to reassert themselves, thus provoking a life-threatening reaction from her Borg implants. Only after the Doctor removed those implants, Seven - which is now her name - was almost completely restored to humanity.

Captain Janeway decided to keep Seven on board, as it was her who was responsible for severing the link to the Borg, and hopes she will choose to stay. Because there's one thing the people on Voyager can offer her which the Borg could not: friendship ...

Currently, she is assigned to the Astrometrics lab.